For the bug lovers among you, check out the gorgeous photography of Ondrej Pakan. You can waste a happy hour browsing this gallery, and there are plenty of wallpaper-worthy images in the collection. The files themselves are not large, but their quality is so high that they can easily be biggified on your monitor with no loss of clarity.
And yes, these bulging red eyes are staring out of my own monitor right now. How can anyone resist such a face?
(Hat tip to Lisa Shaw.)