Hell yeah baby Wallpaper hack works perfectly!!!
Ok so Dual Scene.com Here , is hosting a hack called, "PSPersonalize" it allows you to create and upload your own images into the firmware to change the backgorunds. Since I have been banned from Gaming-age and they are all discussing whether or not to try it I figured I'd be brave and give it a shot, and guess what? IT WORKS!!!!
So for proof and to let people know that it is safe, here is a screen shot of my psp
http://www.simplifykc.com/pspbac.jpg
Just follow the instructions and if you are not familiar with the swap technique figure that out before doing this, unless you have a 1.0 system. Also whenit means the "root" of M2 "memory card 2" it reeally means the root folders where Memstick.ind resides.
Peace out!