I was considering sending my Curve into Colorware, especially with the two day service. However, I have really bad luck with breaking phones, etc. I take awesome care of my BB (obviously) but you never know...
I have insurance for my phone... if I were to get it painted, and something happened and it stopped working, would I be able to still use my insurance or no?
I posed that very question to Colorware and they basically supported what azeis stated. Any alteration or modification to the phone will void and nullify your warranty.