Cool the kids off with a homemade sprinkler. Take a 2 liter soda bottle, poke holes in it. Attach to a garden hose via a male to male adapter that cost less than $5 at Lowes. Toss over a tree branch and let hang. You can adjust how the water sprinkles by adjusting the water flow. When the bottle gets old, just switch it out with another bottle, no additional cost!
These wire work trees are everywhere! You can make them for any occasion, but they are especially great for Mother's Day! You can use the tree branch colors to represent your children's birthstones like in this My Little Tree necklace design.