I just made it up on the spot, ie no pattern. I'd made similar rolls before, so I thought it wouldn't be too hard!
Well it wasn't hard, but with School holidays and both boys demanding my attention, what should have taken 1/2 hour took about 3. I also should have bought the crayons before sewing the lines. I had big fat crayons in mind. The idea of the flap and the top was so the crayons don't fall out, it either needed to be longer or the roll not as tall. You live and learn.
A nice neat package.