Summertime is on, and the kids are out of school. Every mom knows that for these three months it's more important than ever to keep the kids busy. But you don't have to schedule your life away with camps, or drop a bundle on activities and games that come in a box. You can make your own fun, and even include the kids in the prep, with some simple, inexpensive DIY crafts that will keep them playing 'til the lightening bugs come out. Make your own fingerpaint, bubbles, and crayons. Create a fort-building kit and superhero capes that will kick their imaginations into overdrive. Here are 10 of our favorite kid-friendly DIY crafts to fuel your summertime fun.