One of our faves!
The Avatar Hat by Margarita Terekhova calls for one skein of each of two colors (2 skeins total) of Rasta, a soft bulky merino in gorgeous colors.
It's knit in the round in brioche. Don't let it scare you - it's not complicated.
The pattern calls for a size US 17 needle so you'll have this done in a jiffy!
This pattern is available as a PDF download.