I have seen a lot of shaped crayon tutorials, but she had a couple of great techniques I hadn't seen before that you should check out. Like using pieces of straws to make the holes for the yarn. This works for ornaments or a crayon necklace!
Also, instead of putting the crayons in the mold whole, she melted them in a can first:
Having the crayons already melted before you put them in the mold might give them a smoother look. Plus you can toss the cans when you are done for easy clean up!
Head over to Taidye Original to check them out. They are a fun craft for the kids and cute to have around if you are having kids over for a Christmas party!