Melissa Leapman 
Learn to Crochet Mosaic Hats [PDF ebook] 

Using clear instructions and photos, this book will walk you step-by-step through making a basic mosaic fabric and includes patterns for 7 hats. These complicated-looking patterns are created by working simple two-row stripes. On successive rows, stitches are worked into the rows below to create the intricate patterns. It’s as easy as that! Designs are made using Universal Yarn Deborah Norville Everyday(TM) Heathers and Everyday Soft Worsted.