[err4nt]

I think that's selling content creators a little short - I think a lot of visual asset creators would love to contribute but are neither reached out to, nor sought after. It can be intimidating telling a graphics guy: just clone the git repo, put your assets in a fresh branch and we'll merge when were ready. You may as well be speaking Swahili to the poor volunteer! Making publically accessible list of needed assets, and a straightforward submission process for getting assets from contributors to programmers for integration might be the missing piece of the puzzle.

[dublinben]

You're absolutely right that projects need to do a better job of welcoming non-technical volunteers. If some programmers have trouble contributing, it's even worse for everyone else.