I was messing around on desktop manager, deleting some applications and what not. I go to the wallpaper section and the default wallpapers are gone. All my camera pictures are there but the default wallpaper shows "0 items".
Side note: i had also deleted all the default ringtones by accident but i have since restored those.
Alternatively if you have your current OS installed on your PC, just hook up to Desktop Manager and let that reinstall the missing files. This method will also reinstall any other files you previously removed though.
I was messing around with desktop manager deleting applications and i somehow deleted all the ringtones and wallpapers. I have since restored the tones but not the walls..not sure on how much a difference it makes on memory