Mosaic knitting is a great colourwork technique to create geometric patterns in your knits while only knitting with one colour at a time. This hat is a great introduction to learning mosaic knitting.

One size only, but size can be adjusted by increasing or decreasing stitches in multiples of 4

Sample used approx 42 grams of C1 and 15 grams of C2

C1 - 5581 (darker)
C2 - 3521(lighter)