I've never been participating in any project, however I used to work on some easy task on my own. I'm mainly C++ programmer, but my experience is based rather on algorithms usage than handling larger projects. I also used to work on some easy game projects in C# (via SDL.NET). I think I could merge this knowledge.
I'm going to learn some new stuff right now, trying to make some hack attempts. Not sure where to start. I doubt I'll manage to make something useful.