I grabbed the box of ever smaller crayons and set out on a mission. I took any pieces smaller than 1/3 the original size and grouped them by color (all shades of blue, green, red, etc.) and got a little microwave dish out. I out all of one color group in the dish and zapped it on about 70% power for a little over 2 minutes.
When I pulled the dish out it was screaming hot -- and the crayons were melted! There were a few little chunks, but when I stirred it they melted right in. I poured the melted crayons into the molds, left them on the counter, and in about an hour I had new crayons! The best part was that I could do a little batch whenever I was in the kitchen doing something else. No big time commitment.
I'm really happy with these little crayons. They color really well and are easy for everyone to grab - even Reece. I do love when something easy turns out so well :D