Richly-colored (mainly) Victorian book covers. (Covers from Aesop's Fables and Natural History tomes showing birds... and a cat? how's he/she get in here? hm... maybe for some artwork with a feather sneaking out the side of his mouth?)
Note: these fit the cover of the new ATC Sized Faux Book Box (a bit larger than an ATC, but they could also be cropped for using on ATCs).
Blue Bird Book Box by Lora Mahaffey; See the Supply List.
More info in the blog.