According to our recent survey, 7% of students use their body in some way to make a buck.
If you are comfortable taking off your kit then why not try life modelling. Sit there in the buff while budding artists capture your every curve (or pokey bits) in frightening detail! Try RAM, a website especially designed for these kind of jobs.
You could also get involved in clinical drug trials. If this scares you a little then you can find more information here about whats involved.
Warning: Do not do anything you are not comfortable with, no matter how desperate you are for money! There has been an unhealthy rise in student prostitution in recent years do not fall victim to it!