Trace your design using a light box & a .05 black Pigma pen. We prefer this over pencil & wash-out pens, since pencil can rub off or disappear under the crayons. Referring to your pattern, lightly color the base colors. This is the first color listed on your pattern. The second, third or fourth colors are for shading & highlighting.
Periwinkle Lane is much brighter, so your base colors will be applied heavier.
When choosing your background fabric, never use anything with the design stamped on it (like the tone-on-tones). The designs will not absorb the crayon. Anything from muslin to a lightly mottled 100% cotton fabric will do. If you choose a medium to dark fabric, your crayon choices will have to be brighter & your coloring heavier.
Lay a scrap of muslin on top of your block & using a hot, dry iron (cotton/linen setting), press. You will press until you smell the crayon, but not long enough to scorch it. This sets your color. It is permanent & totally washable. A craft iron is not recommended because they do not get hot enough.
Continue to add your next layer of color according to your pattern. Again, press after each application of color. If you find your colors are not bright or dark enough, simply go over the colors again, pressing between applications.
Once all your coloring is done, begin stitching the embroidery for your quilt block.