Janie67 ....I have heard the Prang crayons suggestion as well. I have done this several time with kids. A coupple things that I learned....Back the fabric with freezer paper to get a better color on the fabric ( I usually used muslin), it also gives the kids the 'no color' zone. The more color the better. Make the color really thick and often times I would bring them home and color some more to make them darker. Use fresh paper towels for every block that you do and if you move it use a new piece. Here are a few blocks of the Girl Scout Brownie quilt.
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