You know come to think of it, I'd love a black NES, SNES, PS1 and Dreamcast based on the original designs. Most of my electronics are black and most of my video game systems are black.
I just don't want to spraypaint them or use some weird paint on them, I think an ABS plastic dye would be best solution. A SNES "Super Famicom" would cool to see thou. It would be unique.
Something else you may wanna consider. I'd love to see transparent console cases like the N64, Gameboy, Dreamcast and Xbox did. It's kind of cool seeing the insides of your system.
Also any chance you have any interest in making cartridge case reproductions? Meaning for cart based systems you just make the shell of the cart any colour you want, original colours or in the case for certain NES, SNES, N64, and Gameboy games red,blue,yellow, green, gold, silver, crystal, black white, transparent.
It would be especially helpful for people who want to replace their ratty scratched up used carts. Especially since it took me an hour to get that damn BlockBuster sticker off my N64 cart and now it looks like crap xP