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Idea: "Standing offer: If you contribute a pull request to one of my projects, I'll contribute an equivalent PR to one of yours." Sustainable? No. But that's okay; the real purpose is to identify potential long-term collaborators.
("Equivalent" means if you fix a typo, I'll fix a typo; if you add a test, I'll add a test; if you optimize a function, I'll optimize a function. The nice thing about this is that there's no "language barrier" asymmetry: contributions will occur precisely where skills overlap.)
I think it could be even easier than that. When I contribute a PR, I don't want a PR in return. I just want a timely response (<1 business day is ideal, <2 business days is acceptable). I've found this to be disappointingly rare.
If I find a project I'm interested in contributing to, I'll often start with a trivial PR like a typo fix just to test their response time. If they're slow with that, it dissuades me from contributing something more substantial.
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