Infernal Toast, author of the 0xBitcoin contract, has a new project, an HTML5 Space MMORPG, that will allow in-game 0xBitcoin transfers.
https://www.youtube.com/watch?v=GjiOcfPX0Dk
A beta version is up at http://amber.ethereumspacewar.com/
Reddit: https://www.reddit.com/r/EthereumSpaceWar/
Discord: https://discord.gg/hrngUG3