Confession time...I've only ever crocheted blankets. My go to is The Daphne Afghan from TL Yarncrafts, because it's granny triangles and I get so bored making blankets.

Buuuuttt I'd say a chevron with 3 colors would be great and alternating the colors wouldn't be awful. Yarnspirations.com has a ton of free patterns for all skill levels.