How about a STEM Trivia where you use your Steem House tokens to tokens to take part in. The trivia can be around STEM or something else in the sphere of The Steem House.
Users enter using a small number of tokens and win a percentage of tokens in the pool if answer is correct.
I know it's sounds similar to a raffle but it can also generate interest around the trivia topics.
RE: [BOUNTY] The Steem House Public Brainstorm #1 - What would you like to see offered in exchange for STEEMHOUSE Tokens?