I know a lot of teenagers do baby sitting, so if you're ever offered you should take it big money when it comes to that. Maybe some cleaning around the house, if your parents are willing to give you some sort of job around the house. Outside, when it gets warmer, mowing the lawn or neighbors lawns could hook you up with an easy $15-$20.
Something I know that's gaining popularity among teens is like Dog sitting or Pet sitting. Just some normal suggestions when it comes to getting money without a job.