Classic Game Carts by ~NoSmokingBandit on deviantART
The preview is kinda big, so just go to the deviant to see them.

Theres a GameBoy, GBA, Genesis, SNES, NES, and N64 cart in png format as well as PSDs of each so you can add your own label for whatever games you want.

Everything was created by me in photoshop. Any critique is welcome.