Von schwarz nach orange:
[autoit]
$hGui = GUICreate('test', 400, 330)
For $i = 0 To 165
GUICtrlCreateLabel('', 0, $i * 2, 400, 2)
$sColor = '0x' & Hex(90 + $i, 2) & Hex($i, 2) & '00'
GUICtrlSetBkColor(-1, $sColor)
Next
GUISetState()
Do
Until GUIGetMsg() = -3