Take your best idea and RUN WITH IT! Don't quit college - the degree DOES matter; But use that free time and run all aspects of your "startup" business - create it, deploy it, market it, refine it. You can do that AND keep your classwork up. Once you're out in the post-grad world, the pressure is on - so take advantage of it NOW and see those ideas come to life!!
Go on an info-diet, CREATE, don't CONSUME.