10 things to make out of pvc pipe this summer
PVC pipe water guns
pvc grow rack
DIY PVC pipe and fabric playpen ... can make it as big as you want to allow for exploration ...
PVC Pipe Bow and arrows.
DIY PVC Plant Grow Light Stand - http://thegardeningcook.com/diy-pvc-plant-grow-light-stand/
Whole site has stuff made from PVC pipe
All sorts of cool things you can do with PVC pipe... I'm going to make a tomato stake, but there are all sorts of cool projects.
PVC sprinkler holder, no instructions, just picture
easy to make teeter totter