I don’t usually link to downloadable files. This one is rather exceptional though: a collection of wallpapers and the source of one of the wallpaper.
Source, as in, layered PSD. Also includes sketches. And lighting. And layer adjustments, masking, etc. It’s a must see for anyone trying to make wallpaper (or anything in general). Or maybe not. Whatever.
[ Get here ]
P.S. the site also has many other interesting reads and downloads.