cd decoration

[vaniityx.livejournal.com]

I know there are a lot of crafts for using dead cds, but I was also wondering about craftyness for usable cds. What can I decorate a cd with that won't prevent it from being played, or melt, or explode, etc.? I want to do something besides labels or permanent marker, most likely something to match a book I am making for a friend. Thanks for your help. ♥