An example of such a casino that operates on eth platform is vdice. They have more info in ANN thread (https://bitcointalksearch.org/topic/vdiceioethereum-blockchain-gamblingnew-awesome-version-of-site-1523503), you could check this out and perhaps that will seem interesing to you.
What is your attitude to altcoin-based casinos? And are there many you know of? Do you think such things could make the world of gambling better?
Altcoins can definitely solve the problems with transaction fees and speed that plague Bitcoin's network, but I'm not sure if smart contracts are good enough to build some serious project with them, like decentralized casino. On paper it looks brilliant, but in reality there will be many vulnerabilities, that might cause problems like exploits, which can drain casinos bankroll and leave investors robbed, or some bugs which will lead to loss of players funds. It would require a lot of time and work before decentralized casinos will be able to compete with nowdays bitcoin casinos.