Looking for projects

Hi, I am currently a 3rd year undergraduate physics student It seems at times that all i do is math. I am looking for a way to use my skills in the real world(i.e. engineering i would believe), for fun and some experience. I remember watching some video of a group that would just get together and take old electronics apart end build new things out of them. for example one guy converted a old TV into an oscilloscope. That's the kind of thing I'm looking for, I dont have a TV though. Does anyone have any good ideas for any cool projects that would be challenging? Even better, Does anyone know of any good forums where people get together and collaborate on ideas for projects like this?

Thanks

 

Thanks! this looks really great. A lot of cool project ideas.