This is another idea from iMOM.com
1.When you have accumulated a box full of broken crayons you can gather them up and evenly distribute them (without the wrapper) into a small muffin tin.
2.Bake them in the oven at 200 degrees until the wax is fully melted.
3.Remove the tray from the oven and set it in the freezer for half an hour.
4.Once the wax hardens and cools you should be able to easily remove little "crayon cookies" from the tin.
(If you would like you can add some glitter to the mix before you bake them for a little more sparkle.)
To create tie-dye candles you can follow the same baking instructions above, and use the melted crayon wax to dip small white candles in. You can find the candles in the ethnic food aisle of your local grocery store or at the dollar store. The wax creates a tie-dye effect and you can accentuate the waves by tracing them with glue and adding glitter or acrylic rhinestone jewels.