Comment by hooliganpete

You could try browsing sites like UpWork to check out available projects - maybe these requirement more commitment than you'd like but you'd get an idea of what's available/what others are working on. You could also try trawling business or engineering school message boards - there are often tons of small-scale projects looking for someone to pop in to lend a hand. Short of finding someone else's project to work on, you could focus your efforts on an "mvp of an mvp" - something so incremental and yet complete you could have it in the app store or in beta in a matter of weeks.