The PSP isn't the only Sony console that comes in different colors. OK, so it's not an actual console per se, but apparently there's a silver DualShock 3 PS3 controller that's coming out in a couple of months.
There's no official announcement for this controller yet, but an EBGames listing says that it's going to ship beginning June 24 for US 54.99. It's the same price as a black DualShock 3, so you might want to wait for this if you're in the market for a new controller.
This also lends more credence to rumors of a silver PS3 that's also supposed to be unveiled at E3. Why release a silver controller if there's no silver console to match its color, right?