Escape from Byron Bay makes use of some graphics and sounds, and is available on iOS and Android, although I'm not sure if the Android version has been officially released to the Play Store or not yet. I beta tested it for Alex though, so if it's not, it should be added in the near future.
Also, I started developing a game using graphics and sound effects called Mutagenics, but I haven't really done much with it for a while. You can find it at
http://www.textadventures.co.uk/review/713/ but you can't do much in it as of yet.