I made this Illyria wallpaper for a technical art challenge at Buffyforums, focusing on the use of the pen tool. it was my first attempt at using the pen tool, so that's one of the reasons why it looks a bit rough. (The other reason is that it was a rush job, as always.)
Full-size version here.
Credits: Illyria screencaps by me. Octopus photo by Brian Gratwicke.