Wendy's method really is the best. I've tried Gripzies, and they do okay, but not really great for my daughter's hair. Wendy sells instructions for her method for only $5, and it really is worth it! Plus, Wendy is a super-sweet person to boot!
Her Etsy shop is here: Etsy :: punkynmunky :: Punky N Munky Creative Hair Bows, Instructions, & More