I like how you have your icons arranged and how many there are. I find that a lot of people waste their desktops. Mine are arranged similarly. I also once had that same nebula as my background, but it made things harder to read.
Edit: I took your idea and organized things a bit. Looks much better now.
On my gaming PC, it's a Mushi-Shi picture. I didn't actually finish the first season of Mushi-Shi, something I'd like to go back and do someday, but I did think it looked absolutely gorgeous. Also there's another season, so I have even more to get to.
EDIT: And on my laptop, it's a picture that was posted in here months ago that I haven't bothered changing out. I should probably go seek something new now.