I've put self cling window tint on the back of marquees that were too bright... I'd be careful to make sure the paint isn't flaking though, or the cling will probably pull some of the paint off.
Well today I went with this option on my T2 and I think it was the way to go. The Berzerk next to it now has the brighter marquee of the 2. Next I have to see what works best on the Coke machine light.