Here's a simple 2x2 ribbed hat that you can knit up in a couple of hours. I found this squishy soft Madelinetosh yarn that was perfect for it.
One skein of Madelinetosh A.S.A.P. colorway Mare (90 yards super bulky yarn)
US 13 - 9.0 mm 16" circular needle or dpns
US 13 - 9.0 mm dpns
Continue K2, P2 ribbing until piece measures 11 inches
(switch to dpns when necessary)
Rnd 1: k2, p2tog, repeating until end of round
Rnd 2: k1, k2tog, repeating until end of round
Rnd 3: k2tog, repeating until end of round
Rnd 4: k2tog, repeating until end of round, knit last stitch
Break yarn and thread through remaining live stitches on your needle, pull tight to close the hat up.
Weave in ends.