Have you tried Elance.com?

Its probably my favorite freelance community. There are jobs that there that will take you an hour and others that are 3 months or longer.

Of course, you need to spend time interviewing, convincing companies you can build things, etc.

Its usually harder for college students because the chances are, your portfolio is weaker than someone with years and years of experience. But if you have good works under your belt, its definitely possible