Obviously, the most time consuming part was picking out the exact fabric to match each crayon hue and then cutting them.
I did not use a pattern, but cut my rainbow pieces 2" x 3.5." This may have been a bit on the wide side, as the roll measures a full yard at 36" long. The main fabric piece was cut at 5" x36" with Echino on the front and Ed Emberly scribbles on the back.
I still need to get a button as my original idea of just wrapping the hair elastic around the entire roll did not work out because the roll is so gigantic.
I have yet to show it to the boys. I am in love with it, but I have a feeling they are not going to be impressed! Oh, well - I wouldn't mind keeping it too much!