When your little darlings bring you a box of melted crayons to show you, and then accidentally DROP them on your carpet, don't scream in horror! I have found a solution!
http://www.ehow.com/how_10695_clean-crayon-carpet.html
When you're done, your carpet will be back to the state it was before the 'crayon catastrophe'!
Have a nice, crayon free day!