PhyloPic is an open database of life form silhouettes. All images are available for reuse under a Public Domain or Creative Commons license. [more inside]
Scientific Illustration is a Tumblr blog devoted to... well... scientific illustration.
Cornelia Hesse-Honegger paints watercolours of mutated insects from radioactively contaminated areas in Ukraine, Switzerland, the United States, and Europe. She has recently published a scientific article incorporating these paintings (5 MB PDF). site also available in German