A beautiful DIY with plastic bottles. Tip: Use a medium hot iron and place it on the mouth of the bottle to connect the finish! Use baking paper between the Iron and the bottle, so you don't ruin the iron!
DIY Plastic Bottle Recycling: Starting/Planting garden plants in milk jugs; Most Intriguing -- the milk jug igloo -- on a raised base with the entrance on the leeward side, this could be a nice place to play even in cooler weather.
This genius idea just seems too simple. Create a pen caddy with toilet paper rolls and an old shoe box! Or, use them to organize those pesky cords. ( this page isn't found but I think you get the idea )