A new design to be published this next week, the Stained Glass Fretwork Hat pattern is based on the Greek Fret, often used by the ancients in architecture as well as textiles. Colorful, quick and an easy knit using a slip-stitch color design, this hat uses 1 skein of worsted weight yarn in black, while the color work can be done with small amounts of 3 contrast colors for a stained glass effect. A great way to use up some left over yarn from past projects!