VRCoin. It's a blockchain that simultaneously doubles as storage for items a decentralized virtual space. You require the coin to store/remove items from the space [namecoin for coordinates essentially]. I think once VR takes off there's going to be a desire for a virtual world that's not owned by any one specific entity. The blockchain acts as decentralized storage as well as spam control, so people don't just place dicks everywhere (or rather it would be costly to do so).