i hate wallpapers that fill up the desktop. i like something with either a white or black background so i can center it and fill the rest with black.
http://www2.us.porsche.com/english/usa/cayenne/origin/bloodlines/bilder/bloodlines_foto.jpg
just made that my desktop earlier today.
site does have a nice collection of pics "stolen" from the rest of the net. hey, at least they are easy to find.