I tried this idea in a plastic paint roller tray and got an entirely different back of the tray look.
<img src="/ubbthreads/images/graemlins/doh.gif" alt="" /> <img src="/ubbthreads/images/graemlins/rolleyes.gif" alt="" /> <img src="/ubbthreads/images/graemlins/grin.gif" alt="" />