I first saw this idea at a craft show and I think they were selling them for $10. I thought.....I can make that for less and I did. I made one for $2.50 and I made another one for a gift and used the crayons that I had price matched for .39¢/each to put in them. I found this tutorial here from a wonderful crafty site called "Make It and Love It". I found it simple to follow because of the pictures. I am a visual learner, obviously.
Excuse the quality of the pictures. I am still learning with my new camera. I desperately want to take a digital photography class:)