Something I have tried is wash-away stabilizer. It comes in a large roll and I have it for when I do my embroidery. I just trace my design on the stabilzier and use a spray of spray baste to attach to the quilt. Then I just stitch on the lines. When finished, trim away the excess and wash the quilt. The stabilizer completely washes out without leaving a residue and you don't have to worry about pulling stitches. It might work out to be a bit cheaper then buying all those patterns.