Greetings from outside Sacramento, CA. I took a class using crayons and embroidery.
We pressed freezer paper to the back of the fabric to give it more body.
We used muslin. The teacher said not to use white on white because the crayons don't transfer evenly.
We taped the block down on a light box using painter's tape to keep it from wiggeling around in the coloring process.
We used pigma pens to transfer the design on the muslin.
We used regular Crayola crayons (not the fabric crayons).
When you want to blend colors, lay down a layer of white crayon first.
Use a circular motion to get the most even distribution of the crayon.
When you have finished coloring, take off the freezer paper. Place the colored block between layers of paper towels and use a hot iron to melt off the wax. CAREFUL: Make sure to protect the ironing board and the iron from wax.
If the color is not intense enough, you can color over it again.
Embroidery and beading happens last.
Most importantly, have fun. It's a great way to let out the inner child.