I don't think MS and Sony want the headache of so many more SKU's that would create. Think about it, the Wii has what, 1 model? Different colors would be a different SKY, so they have what? 3 SKU's? I think Sony and MS both had over 3 SKU's in the first year (with all the different HDD sizes, etc)
Besides, if you REALLY want to, just paint it, go look at some of the pics online of people's PS3's
Unicorns ARE real - They are just fat, grey and called Rhinos








