I recall seeing somewhere that one could take the case plastics off and dye them with plastic dye. I can't seem to find where, though. I'm sure its totally possible, but it would be a lot of work, and in my eyes not a lot of return besides bragging rights, unless you have a fervent desire to be different. I personally would be sure at least to get a second set of spare cases (the bottom, top case, etc.) beforehand so if it doesn't work, you ruin it, or you just don't like the result, it's a matter of swapping out the case to get it back to the way it was.
Sorry I couldn't have been of more help.