I think it's a good idea. I'd look into eventually putting the memes on an Ethereum sidechain that enables low/zero cost transactions, like one of Loom's DappChains or the POANetwork.

Ropsten is fine to start off which, but a testnet can't be relied upon to be stable.

Also, I'd look into making the memes non-fungible ERC721 tokens, to enable transferrence/trading.