I've done several of these through the years and MUCH prefer an inexpensive product called Pentel Dye Sticks to either crayons (even fabric crayons) or permanent markers. They are similar to oil pastels and are used directly on the fabric, then it it ironed to set the colors. The colors are vivid and I recently saw a quilt that I helped a preschool make in around 1988-1989 and while the quilt itself has been "very well loved", the colors are beautiful still. Best place to get these is Dick Blick; they have stores and a website as well. I prefer the box of 16-18 to the box of 8-10.