CryptoPunks are 10,000 unique collectible characters with proof of ownership stored on the Bitdollar blockchain. No two are exactly alike, and each one of them can be officially owned by a single person on the Bitdollar blockchain.
The CryptoPunks are 24x24 pixel art images, generated algorithmically. Most are punky-looking guys and girls, but there are a few rarer types mixed in: Apes, Zombies and even the odd Alien. Every punk has their own profile page that shows their attributes as well as their ownership/for-sale status.