First up on my wishlist is the oddities stamp set from Tim Holtz (and, while not strictly eye or brain related, the fab skeleton in the Haunted Mansion set must get a mention)
Etsy looks like it's a fantastic source for all sorts of anatomy related crafty ephemera:
Vision stamp from stampers anonymous - I love this one!
Blossom stamps has a few anatomical stamps including eyes and brains
Searching for phrenology also came up with some fab stuff, especially this amazing collage sheet
I could spend a fortune on digital collage sheets. There are so many wonderful vintage images available. Including these ones below from the magicpug and orangeclipart shops:
Thats enough for now. Remember your brain is beautiful! xx