There have been days where I've actively searched for some OSS project that is accessible enough for me to work on - because usually the ideas I have myself are things I'm not capable of! Or I just need to think more about how to get started, and when in this mood I'd rather just get hacking on someone else's project's issue.

My point is, issue triaging could be a great way to learn the ropes of a project (and get to know the team a bit), and you'd probably find yourself occasionally (then gradually more often) thinking "hey, actually I reckon I can have a crack at this myself". That'd be really satisfying for a never-contributed-before fresher.