CryptoKitties - Breed and collect adorable creatures using Ethereum
Crypto Corgis - Crypto corgis live (and die) on the blockchain
CryptoAlpaca - Adopt unique alpaca on blockchain and shear wools everyday
Mars Genesis - 10,000 unique parcels of Mars stored on the blockchain
CryptoKittydex - A tool to help CryptoKitty geneticists decode the genome
Cryptopurr - Facebook for cryptokitties built on Ethereum