<Viewbox Child="{StaticResource MyImageResourceKey}" Width="100" Height="100"/>

<ItemsControl ItemsSource="{Binding Images}">
        <ItemsControl.ItemTemplate>
            <DataTemplate>
                <Viewbox Width="100" Height="100">
                    <ContentPresenter Content="{Binding Image}"/>
                </Viewbox>
            </DataTemplate>
        </ItemsControl.ItemTemplate>
    </ItemsControl>

public class ViewModelSomeWindow : INotifyPropertyChanged
{
    public class MyImage
    {
        public object Image { get; set; }
    }

    private ObservableCollection<MyImage> _images;
    public ObservableCollection<MyImage> Images
    {
        get { return _images; }
        set { _images = value; OnPropertyChanged(); }
    }
    ...
}

Images.Add(new MyImage() { Image = App.Current.Resources["MyVectorImage"] });