Wash cars or bikes if you have a big enough driveway. Gather some sponges or old rags, towels, car washing liquid, a big bucket, and a hose and set up a washing station in your driveway for a few hours on the weekend. Scrub each vehicle, focusing on any dirty spots, rinse it thoroughly, and buff it dry with a microfiber towel. Charge $10 to $20 per vehicle.
Throw a bake sale if you like to cook. Choose classic recipes that are easy to make in big batches like chewy chocolate chip cookies, fudgy brownies, or vanilla cupcakes. Once you bake everything, separate your goodies into individual servings and place them in pretty packages like treat bags tied with ribbons. Set up a stand in your front yard or out on the street corner to get more traffic.
Work remotely for a call center. Because many call center jobs are location independent, finding work in this field is an easy way to earn some money from home. Dozens of sites list job openings for call-center representatives, including Freelancer.com and SimplyHired.com. Meanwhile, you should check local job listings for openings and opportunities as well.