Just a few images available of the microscopes ability to capture the molecular structures of various things. There are some wallpapers also for those of you who are into biology. From the FL State Univ.
Collagr.com gives users the ability to generate backgrounds from images they have stored in multiple places on the internet. They can then place that background image on their MySpace/YouTube/Break.com page. Right now they only support getting images from Flickr, but they are adding a lot more image sources and extra graphic editing functionality very soon.