Well for me, you can use your hobbies and talents to earn extra money. Like if you can do AutoCAD, Adobe Photoshop, Macromedia Flash etc, you can get money from that too. Help your friends who does not know how to do projects using those softwares and get paid in return.
Maybe you can also do things like mow the lawn, wash cars, deliver newspapers, sale, pet sitting, recycle, being a tutor, baby sitting, etc. Maybe you can do part-time job if allowed too, like being a cashier, waiter, etc.