Gui, Color, Green
Gui, +AlwaysOnTop -Caption
Gui, Show, % "x" A_ScreenWidth - 100 "y" A_ScreenHeight - 100 "w100 h100 Hide"
1::
PixelGetColor, Color, 0,  0
If (Color = 0x020101){
    Gui, Show
    Sleep, 5000
    Gui, Hide
}