There was a "Limited Edition Green and Gold Neotones" version of the Game Boy Color, which was released exclusively in Australia. The front of the handheld has pictured the Australian flag with text underneath it reading, "Ozzie! Ozzie! Ozzie!"
Many Game Boy Color games released close to and after the release of the Game Boy Advance offered special Game Boy Advance features, usually a different color palette designed for the Game Boy Advance screen. The Legend of Zelda: Oracle of Seasons and The Legend of Zelda: Oracle of Ages, for example, included a special shop that could only be accessed when the game was played on a Game Boy Advance.
On the Game Boy Color logo, each color in the word "Color" represents one of the colors the system was originally manufactured in.
If an original Game Boy game is inserted, it's possible to change the color of the game at the start up screen. This is also the case with the Game Boy Advance.