Here are some crayons I mixed up for her birthday! I had a peanut candy mould and asked my community for broken and unwanted crayons. They definitely delivered! I got 3 bags full that I picked up from kind people who had them sitting around.
I separated out and used only the Crayola brand ones so the consistency would be the same for all the crayons since I planned to mix colors.
Then I soaked them in water inside of a ziplock in the sink to get all the wrappers off. Most came off pretty easy but some of the older crayons had a tougher adhesive.
Basically I broke them up even more to fit in some silicone cupcake cups, and picked my color combos! I put them in the oven at 300 degrees and kept an eye on them so they wouldn't burn. Within a few minutes the cups had melted colors!
To add swirls, use a toothpick and keep adding wax til you fill the moulds!
Took quite a bit of time and my kitchen smelled like melted crayons for a while but Winnie just loves them. I put them in a cute vintage cookie jar and she uses them all the time!
You can basically use anything for a mould so experiment and get creative. Remember if they don't turn out, you can always melt them down again!