Surprisingly, Till now nobody has given you the option of
Lending.
Just follow the rule of collateral and make sure somebody do not transfer you fake/low volume token. I guess you will be fine.
I was hoping someone would mention it. Lending can be risky if you aren't using a reputable provider, but can create a continuous flow of Bitcoin back to your account.
One exchange you can look at to learn more about lending is Poloniex. The way it operates is very straight forward. You can take a look at it here:
https://poloniex.com/lending#BTCThose offering their coins to lend offer them at a certain daily % interest rate, and those wanting to borrow coins offer to take those loans at certain rates. The lending and loaning part offers work like trades on an exchange, and when offers meet/overlap the are executed. When the coins are done being loaned, you are given your % interest based on how long the other party borrowed your coins.