Finally tracked down the fullscreen wallpaper files and made an example for everyone. Also included is a matching high quality default wallpaper for non-fullscreen, though it suffers from the black line below the taskbar issue. Hopefully Cookiemonster will patch it up in the future sometime
I didn't make lots of wallpapers as I guessed everyone would have there own preference. You can use the files in the zip as your template or if you ask nicely and provide a 480x800 I'll convert it (or someone else here will).