Hmm...well, you can use some gold/light blue colors (since it has both Gold and Crystal stuff in it), and maybe work in this pic of the Tin Tower (
http://i3.photobucket.com/albums/y96/GymLeaderLance99/tintower.jpg ) with the sprites of Ho-Oh (
http://www.pokemonelite2000.com/pkrs385.gif ) and Suicune (
http://www.pokemonelite2000.com/pkrs380.gif ). I dunno, I'm not really that creative when it comes to this stuff. XD;