I don't know exactly about Ethereum blockchain, but I think I have seen one advertised in Twitter that runs on the blockchain of ICON.
ICONbet is the name, I just searched it, but I won't be sharing the URL coz this is not the topic and to not be considered a spammer
If this one I think that runs on this blockchain, it would be logical that others can run on Ethereum's. In fact, it seems strange to me not to exist plenty of them already, after having invented cryptokitties and all this strange stuff. Maybe someone knows concrete projects and can share.