Looking for extra income..any ideas?

I'm 18 years old and going to college next year. I work 12-15 hours a week at a local drugstore making 7.35/hr. I also caddie in which I make $120 a day 2-3 days a week. Because of Yahoo Answers I also am a member of InboxDollars which gives me an extra $30 every 2-3 months. However, I still have way too much time that I don't use and I'd like to use it to make money. Is there any jobs that I can do from home that pay decently? Any ideas would help enormously.