Glass Mason jars are perhaps the ultimate upcycling ingredient of all time. They come in all shapes, sizes, and even in a variety of colors. Mason jars can be used to give wonderful homemade edible gifts, as well all know, but after the eating’s done, jars like this can take on a whole new life. We’ve rounded up some of our favorite kid-friendly Mason jar projects, perfect for whiling away a rainy afternoon or hiding out from the summer heat. Whether your kiddos have a green thumb or want to capture rainbows in their jars, we’ve got a craft (or two!) to suit everyone’s taste—even the adults in the house. Check out what you can do with an old Mason jar and supplies you probably already have around the house!