Ether's Ark takes the successful elements from Cryptokitties and mixes it with a reversed pyramid scheme of sorts.
Very similar to Cryptokitties you can buy a pet ( or multiple, cause hey breeding.) and more or less do nothing with it. Instead of the traits found in your precious kittens you get a precentage every time someone adopts your offspring hence giving you the incentive to pawn it away as quickly as possible.
Adoption
However breeding is not the only way you can earn some ethereum. The game is built around how anyone can adopt a pet at any time. The only catch is every time it get adopted the price increases. Apparently being a good samaritan isn't enough on the blockchain.
If someone believe they can take care of Stinky linky the lizard better than you all they have to do is pay the adoption fee. However when they do you get your original deposit back plus a little extra for keeping up with Stinky.
As you can tell there is a lot of opportunity here to earn some Eth... As long as someone else is willing to take over your task
Over all I'd say Ether's Ark is worth checking out to see if it fits you.