This mosaic hat can be made using any aran weight yarn. It’s easy to make but looks complicated.
MATERIAL NEEDED:

4 weight yarn in 2 contrasting colors
Approx 130 yds main color
Approx 50 yds secondary color
5mm Hook
Scissors
Stitch Markers
Tapestry Needle
Pom Pom (if desired)

Stitches used and abbreviations:

Ch - chain stitch
St - stitch
Sc - single crochet
Sctog - single crochet two together
Hdcblo - half double crochet in back loop only
Hdctpg - half double crochet two together
Sl st - slip stitch
Sk - skip stitch
Sp - space
Dc - double crochet
Trc - treble crochet
FO - Fasten off