I think Master Contract Token (MCT) have 100x potential. It is NEP-5 compatible, directly tradable by smart contracts without off-chain code and ability to pass additional parameters along with a token transfer to a smart contract. Thanks to  MCT a smart contract author can deploy a contract requiring basic storage capabilities for 90 GAS instead of 490 GAS a substantial savings. This makes MCT quite valuable.

Besides these, MCT will be used for payment in Hush Puppies game.

Look their Github Page for more information: https://github.com/Splyse/MCT/blob/master/README.md