<ListBox>
    <ListBox.ItemContainerStyle>
        <Style TargetType="ListBoxItem">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type ListBoxItem}">
                        <Border Name="Border" BorderBrush="DarkGray" BorderThickness="1" Margin="3">
                            <ContentPresenter />
                            <Border.Background>
                                <SolidColorBrush />
                            </Border.Background>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsSelected" Value="True">
                                <Trigger.EnterActions>
                                    <BeginStoryboard>
                                        <Storyboard>
                                            <ColorAnimation Storyboard.TargetName="Border" Storyboard.TargetProperty="Background.Color" To="#3e8bff" Duration="0:0:0.1" />
                                        </Storyboard>
                                    </BeginStoryboard>
                                </Trigger.EnterActions>
                                <Trigger.ExitActions>
                                    <BeginStoryboard>
                                        <Storyboard>
                                            <ColorAnimation Storyboard.TargetName="Border" Storyboard.TargetProperty="Background.Color" To="White" Duration="0:0:0.1" />
                                        </Storyboard>
                                    </BeginStoryboard>
                                </Trigger.ExitActions>
                            </Trigger>
                            <MultiTrigger>
                                <MultiTrigger.Conditions>
                                    <Condition Property="IsMouseOver" Value="True" />
                                    <Condition Property="IsSelected" Value="False" />
                                </MultiTrigger.Conditions>
                                <MultiTrigger.EnterActions>
                                    <BeginStoryboard>
                                        <Storyboard>
                                            <ColorAnimation Storyboard.TargetName="Border" Storyboard.TargetProperty="Background.Color" To="Orange" Duration="0:0:0.1" />
                                        </Storyboard>
                                    </BeginStoryboard>
                                </MultiTrigger.EnterActions>
                                <MultiTrigger.ExitActions>
                                    <BeginStoryboard>
                                        <Storyboard>
                                            <ColorAnimation Storyboard.TargetName="Border" Storyboard.TargetProperty="Background.Color" To="White" Duration="0:0:0.1" />
                                        </Storyboard>
                                    </BeginStoryboard>
                                </MultiTrigger.ExitActions>
                            </MultiTrigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </ListBox.ItemContainerStyle>
    <ListBox.Items>
        <sys:String>hey</sys:String>
        <sys:String>du</sys:String>
        <sys:String>dux</sys:String>
        <sys:String>duy</sys:String>
        <sys:String>dua</sys:String>
    </ListBox.Items>
</ListBox>

<ControlTemplate.Triggers>
  <MultiTrigger>
            <MultiTrigger.Conditions>
                <Condition Property="IsMouseOver" Value="True"/>
                <Condition Property="Selector.IsSelected" Value="False" />
            </MultiTrigger.Conditions>
            <MultiTrigger.EnterActions>
                <StopStoryboard BeginStoryboardName="SelectedBegin" />
                <StopStoryboard BeginStoryboardName="UnselectBegin" />
                <BeginStoryboard x:Name="EnterBegin" Storyboard="{StaticResource MouseEnterSb}"/>
            </MultiTrigger.EnterActions>
            <MultiTrigger.ExitActions>
                <BeginStoryboard x:Name="LeaveBegin" Storyboard="{StaticResource MouseLeaveSb}"/>
            </MultiTrigger.ExitActions>
        </MultiTrigger>
        <Trigger Property="Selector.IsSelected" Value="True">
   <Trigger.EnterActions>
                <StopStoryboard BeginStoryboardName="LeaveBegin" />
                <StopStoryboard BeginStoryboardName="EnterBegin" />
                <BeginStoryboard x:Name="SelectedBegin" Storyboard="{StaticResource SelectedSb}"/>
   </Trigger.EnterActions>
   <Trigger.ExitActions>
                <BeginStoryboard x:Name="UnselectBegin" Storyboard="{StaticResource UnselectSb}"/>
   </Trigger.ExitActions>
  </Trigger>
 </ControlTemplate.Triggers>

<ListBox>
<ListBox.ItemContainerStyle>
    <Style TargetType="ListBoxItem">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ListBoxItem}">
                    <ControlTemplate.Resources>
                        <Storyboard x:Key="BorderAnimationToRed">
                            <ColorAnimation Storyboard.TargetName="Border" Storyboard.TargetProperty="Background.Color" To="Red" Duration="0:0:0.1" />
                        </Storyboard>
                        <Storyboard x:Key="BorderAnimationToBlue">
                            <ColorAnimation Storyboard.TargetName="Border" Storyboard.TargetProperty="Background.Color" To="Blue" Duration="0:0:0.1" />
                        </Storyboard>
                        <Storyboard x:Key="BorderAnimationToOrange">
                            <ColorAnimation Storyboard.TargetName="Border" Storyboard.TargetProperty="Background.Color" To="Orange" Duration="0:0:0.1" />
                        </Storyboard>
                        <Storyboard x:Key="BorderAnimationToWhite">
                            <ColorAnimation Storyboard.TargetName="Border" Storyboard.TargetProperty="Background.Color" To="White" Duration="0:0:0.1" />
                        </Storyboard>
                    </ControlTemplate.Resources>
                    <Border Name="Border" BorderBrush="DarkGray" BorderThickness="1" Margin="3">
                        <ContentPresenter />
                        <Border.Background>
                            <SolidColorBrush />
                        </Border.Background>
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Trigger.EnterActions>
                                <BeginStoryboard Storyboard="{StaticResource BorderAnimationToOrange}"/>
                            </Trigger.EnterActions>
                            <Trigger.ExitActions>
                                <BeginStoryboard Storyboard="{StaticResource BorderAnimationToWhite}"/>
                            </Trigger.ExitActions>
                        </Trigger>
                        <Trigger Property="IsSelected" Value="True">
                            <Trigger.EnterActions>
                                <BeginStoryboard Storyboard="{StaticResource BorderAnimationToBlue}"/>
                            </Trigger.EnterActions>
                            <Trigger.ExitActions>
                                <BeginStoryboard Storyboard="{StaticResource BorderAnimationToWhite}"/>
                            </Trigger.ExitActions>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ListBox.ItemContainerStyle>
<ListBox.Items>
    <sys:String>hey</sys:String>
    <sys:String>du</sys:String>
    <sys:String>dux</sys:String>
    <sys:String>duy</sys:String>
    <sys:String>dua</sys:String>
</ListBox.Items>