it's nice to see a comrade in arms as far as psp theming goes !
like you, psp is eternal for me and while i have been quiet in the side of themes for years now, that is something i intend to fix one of these days.

your theme is neat by the way, just not my cup of tea really, i prefer the non-themed themes if that's even an expression :P
the kinda things i used to do, just slap any wallpaper from any thing you like into one and it works with everything instead of being tied to something specific because of icons or something (like your pokeballs, doesn't really work well if you put a doom wallpaper on it xD)