Game Boy Color x2 - Yellow & Pink. My sister had the pink one and I had the yellow one, now I have them both.
Game Boy Advance - Blue.
Nintendo DS "phat" - Silver.
Nintendo DS Lite - Lemon Green.
Nintendo 3DS - Light Blue.
PlayStation Portable - Black.
Looking at others' game systems amount, I have rather few of them. I'm mostly using DS Lite, 3DS and PSP.