Some enterprising Sidekick owner has done, what was until now, the impossible. He's found out a way to load custom backgrounds onto his sidekick. Not only that, with his theme-hack you can load in custom icons, sounds, and splash screens.
Now, we're off to load up our SK3 with pictures sounds of Paris taken from screen-caps of One Night in Paris.
Custom Backgrounds on your SK3 [Hiptop3 - Thanks Bryon!]