Can’t go wrong with a high resolution shot of your favourite car.

Pets are always good if you have a pet or just go to yahoo image search and search for something cool. You are creative think of a cool one.

P.S I know your creative because it looks like you put lots of effort into your avatar.

I try to keep a simple background, that way you can find things faster on the desktop.
Pick something with good form, a sketch of something you like, an interesting tattoo or abstract lines, and place it in front of a solid color. It won’t distract but still makes a statement.