I have been using the Luna VX theme for Windows XP for quite a while now, but lately I have grown bored by it. Time for a change!
I have chosen to install Microsoft's unofficial Royale Noir theme. It looks pretty cool (even though I wouldn't mind if it would be a little darker).
I also decided to ditch the default desktop background that came with my Dell XPS laptop. It is hard to pick a desktop background because there are so many cool backgrounds. I really liked the "Darkness to Light" background but decided to go with the excellent "Circles" background instead: