Robert Bolesta has created a lovely alphabet out of formed chunks of ground beef in styro trays. Link (Thanks, Robert!)
Rustic found alphabet
Found alphabet made from human brains
The Dinosaur Alphabet by Hal Robins
Naturally occuring alphabet on the wings of butterflies
Cartoonist challenge: illustrated A-Z in an hour
Modded plastic soldier alphabet
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.