It was easy, fun, and even educational.
First I bought a rubber ice tray at the dollar store that we filled with the naked, broken crayons from the crayon bin.
Next we took the ice tray and put it in our experiment pan (I know the pan looks rough but it gets a lot of serious non-cooking use). Then we put the pan out on the dashboard of the mini van, shut the door, and left it there in the heat. (I don't know where you live but here it is still HOT!)
In less than and hour the crayons had melted. So we brought them in and because we are impatient put them in the freezer to help the wax set back up quickly.
Finally we popped them out of the tray and had our very own crazy homemade tiki crayons which we used while we talked about things like solids versus liquids and reasons why kids can't stay in cars watching a movie instead of going into grocery stores with their mother.
Like I said, easy, cheap, and even educational. And since our warm weather is going to be gone all too soon I'm glad we tried this out before it was too late.