I made a tutorial at the prodding of a forum-goer, based on that newest wallpaper I made. The tutorial can be found here. It's five pages long, and details sketching, inking, and coloring digitally.
If you like that wallpaper enough, why don'tcha buy it, and 6 others, for 5 dollars?
If you join the forum, you can find them in the Registered Users Only section.