Right now 24 packs of Crayola Crayons are cheap at back to school sales. Stock up if you want to make homemade crayons in lots of different shapes all times of the year! Last February I followed Family Fun's Crayon Hearts instructions to make crayons for my daughter's Valentine/birthday goodie bags. *A couple tips: I slit the wrappers off carefully with a craft knife (some were still difficult to get off). Do not use other (cheaper) crayon brands if you want them to melt good and color great!
There are a few different ways to make recycled crayons. I have yet to try the tin can method (Momtastic, Chica and Jo & Squidoo) but I plan to soon. The microwave method with a silicone tray went poorly for me (julie-k). I think the oven method is the best (Make and Takes & Family Fun) and it was easier to get the crayons out from the mini muffin tin than silicone ice tray.
The silicone heart ice cube tray pictured was found in January at Target in the front cheap section ($2.50/2 pack). IKEA sells fun-shaped ice trays ('Only intended to be filled with water') and I found a flower-shaped one at Dollar Tree recently (haven't used it for crayon melting yet). Michaels also has seasonal shaped baking pans. Use caution when heating any of these trays in the oven or microwave.