My own favourite is Accelerator Token (ACC). Got these via an airdrop at the back end of 2017. These are linked to a hydro powered mining facility in the U.S, and the tokens can actually be staked to mine more ACC tokens, or even to pay for time on their mining facility in order to mine monero, bitcoin gold, z cash or a number of other coins. The ACC tokens themselves are listed on coinmarketcap at the moment at around 15 -17 dollars each, which considering that I got them In a free air drop is pretty good. According to their website mining calculator I could mine the 31 I was sent and create another 93 ACC tokens by just sending them from myetherwallet to my own etherwallet address (This is how they are mined.
Cool.