Some ideas off the top of my head (Patreon)

As a means to find out ways for me to earn money, I'm thinking about "Group commissions", meaning, I come up with a blank slate for an art piece, where the location, timing, props, subject matter etc are all left blank and people are invited to place their bids for any words they desire as an auction?

or maybe a "Your character here" kind of thing. hmm