Herb Williams uses crayons as a medium: in a unique way. From his website:

I am the only individual in the world with an account with Crayola. I get these colors individually packed 3000 to a case. I cut down the sticks to the length I need by hand with either double guillotine cigar cutters or large breed dog nail clippers. I then bond the paper, not the wax, to a form I have carved or cast, completely enveloping the form. Lately I have been casting the completed crayon sculptures in a silicone jacket mold with a two-part epoxy resin and then painting the resin sculpture to look like the original, for a small edition. The sculptures beg to be touched, so when they are cast it makes the handling of them that much easier.