(This is my first instructable, so...wish me luck!)
Step 1: Choosing and unwrapping the crayons.
Look for crayons that may have spots of other colors on them, or are dull and can't color any more, or just some extra ones you have lying around.
Foolproof way to get the wrappers off:
Get a bowl and put some water in it. Add a few pieces of ice then let the water get cold. Put in your crayons, wrapper and all, and let them sit for about 5 minutes. Now there are 2 ways you can go with this.
If the wrapper will peel off easily-ish:
Snap the crayon in half and peel off the wrapper from the part where the wrapping is a little above the crayon.
If the wrapper is still on there:
Put the crayon vertically on a table. Get a knife (not super-sharp) and gently slide it downwards on the crayon until you see part of the actual crayon. Peel it off after that.