Outdoor Chalkboard: Take your creativity outside and add a chalkboard to your fence. Paint some plywood with chalkboard paint then attach it to your fence and let your kids loose to put their best work on display.
DIY Jetpack: Have a couple of empty 2-liter water bottles? Then you're half way to making a homemade jetpack sure to give your kids lots of imaginative fun. Have your child help you decorate and assemble it then watch as she blasts around the house.
Cardboard Ball Maze: Cardboard boxes are infamous for becoming a play toy. From boxcars to robots, a child's imagination can take one anywhere. Cut one open and glue some paper towel rolls or toilet paper rolls at an angle on the inside to create a maze. Stand upright and send balls down. Have fun watching them roll. Tutorial via A Happy Wanderer
Slime: A fun sensory activity that will keep your kids entertained for hours. The best part is it's only two ingredients. One part clear Elmer's Glue and one part liquid starch. Add some food coloring if you really want to get creative. Your kids will love it.