A local quilter introduced me to that technique. It works great. Make sure you don't iron where you want to wash it out. The soft, crayola color pencils (bright yellow, silver etc) work great, and erase better than any quilt pencil I have ever used. Another technique, If you have a pattern to trace on or print out - get it on one of the water soluble paper foundation papers. I like June Tailor's Stitch n wash. It is barely right to call it paper...so thin. Will run through the printer or copier. Vanishes with a mister of water where the stitches are. No gummy residue. Something to try next time. If you are free motion quilting, doodle your favorite drawing, scan a kids drawing or scan a Zentangle you drew...and now you have a quilt pattern to stitch through. BTW, there are 1000s of free Zentangle designs online to inspire you. Have fun and good luck.