Well, look here! The Gay Gamer has compiled a great image that features most of the casings that our favorite "little games" have been enclosed in over the years. Portable games certainly come in a staggering range of shapes and colors, eh?
But wait--someone is missing.
No, no. He's just late (he was picking up munchies).
This is my own contribution--a Game Boy Color cartridge. These babies were designed to function exclusively on Nintendo's Game Boy Color, hence its distinctive clear casing. Released in 1998, the Game Boy Color was a full-fledged successor to the original Game Boy. It was a handsome little workhorse as far as portable systems go, though its performance was eventually eclipsed by the Game Boy Advance in 2001.
The game I'm holding is Dragon Warrior III, a fantastic GBC adaptation of Dragon Quest III for the Super Famicom (released in Japan only). The game was one of the first attempts to revive the Dragon Quest brand in North America, an attempt that has proven quite successful.
Incidentally, Dragon Warrior III for GBC was one of the last Dragon Quest games to be localized under the "Warrior" moniker, if not the last. Enix (now known as Square-Enix) reclaimed the English rights to the name "Dragon Quest" shortly thereafter. Said rights had been held by TSR (the original publisher of the Dungeons & Dragons game modules) for quite some time.
The rest is history.