What kind of project do you want to work on with other people? I am thinking tiny but usable mobile app, desktop apps are great starters. People could even work on the same thing just for practice.
I'd be game for pretty much anything, honestly. Mobile or desktop, whatever. As a relative beginner, it's kind of daunting to approach a non-toy programming application, so I just find myself doing classical crypto applications (for example). Doing something actual, even if small and goofy, would be really cool.