Here are the official wallpapers. Just in case you're too lazy to hop onto the official sites for them.
[1024 x 768] [800 x 600]
[1024 x 768] [800 x 600]
[1024 x 768] [800 x 600]
[1024 x 768] [800 x 600]
[1024 x 768] [800 x 600]
None of them were made by me.