Black Diamond hat has some lovely colorwork, worked in 3 different colors (but only few rounds have all 3 at the same time). Pattern can be also easily be modified to 2 color version.

Pattern has 3 different sizes, fitting for head circ. ~ 46 (52, 58) cm / 18.5 (21, 22)”, and has chart for colorwork and written instructions otherwise.

Detailed yarn requirements:
C1 85 (95, 105) m / 93 (104, 115) yds
C2 55 (60, 66) m / 60 (65, 73) yds
C3 27 (30, 33) m / 30 (33, 36) yds

Happy knitting!