So i tryed this:
original line inside CircleLauncher.ini was this : MouseOverAction=[!SetOption #CURRENTSECTION# ImageTint "255,255,255"] #I#
that changes the tint
so i added the following MouseOverAction=[!SetOption #CURRENTSECTION# ImageTint "255,255,255"] [!ActivateConfig "Circular Icon Launcher\LoL" "background.ini"] #I#
When you've installed the mentioned package, the Circular Icon Launcher\LoL\background.ini skin doesn't exist. I suppose you've created it. Am I right?
If I am, have you told Rainmeter about the new skin? You have to make a Refresh all (right click the Rainmeter icon in System Tray, then click Refresh all). This way Rainmeter will know the new skin and will be able to load it. Otherwise it doesn't see the skin and as such can't load it.
In such cases the Log can be very useful. Take a look there to see if there are error messages. If I am right and Rainmeter indeed doesn't see the new skin, this will be shown in log.