I think this Ms. Ward wallpaper from Grow House Grow is just awesome. It is inspired by Mary Ward, a self-taught entomologist from Ireland in the 1800s. She wrote a series of books on insects, one of which–A World of Wonders Revealed by the Microscope (1858)–was reprinted eight times.
If I were going to put wallpaper in the house, this pattern would be at the top of the list. (Via Design Sponge)