This cabled beanie was made as a "Fifth Doctor" (from Doctor Who) hat but I think it would be a nice hat just by itself, too. It's a simple cable (my first cabled project) so don't be scared to give it a try!
You need: 1 skein of sport weight yarn in your main color (white), a small amount of two different accent colors in sport weight or worsted weight (red and black), green worsted weight (for the celery), size 4US 16" circular and double-pointed needles, and a 6-prong knitting spool (for the celery).
Using a 16-inch size 4 (US) needle cast on 140 sts in main color, place marker, and join in the round being careful not to twist.
Work the following rounds in 2x2 ribbing:
2 rounds white
2 rounds red
2 rounds white
4 rounds red
2 rounds black
4 rounds white
Work 8 rounds of (K6, P2, K4, P2)
Cable round worked as follows: slip 3 sts onto a cable needle or spare dpn, hold that in front of your work, knit the next 3 sts, then knit the 3 sts off the cable needle, then P2, K4, P2. Repeat to end of round.
Work 14 rounds of (K6, P2, K4, P2)
Cable round
Work 14 rounds of (K6, P2, K4, P2)
Cable round
(K6, P2, K, K2tog, K, P2) to end of round
(K6, P2, K3, P2) for two rounds
(K6, P2, K, K2tog, P2) to end of round
(K6, P2, K2, P2) for two rounds
(K6, P2, K2tog, P2) to end of round
(K6, P2, K, P2) for two rounds
(K6, P2, P2tog, P) to end of round
(K6, P4) to end of round
(K6, P, P2tog, P) to end of round
(K6, P3) to end of round
(K6, P, P2tog) to end of round
Cable round: twist the cable in the K6, then P2, to end of round
(K2, K2tog, K2, P2) to end of round
(K5, P2) to end of round
(K2, K2tog, K, P2) to end of round
(K4, P2) to end of round
(K, K2tog, K, P2) to end of round
(K3, P2) to end of round
(K, K2tog, P2) to end of round
(K2, P2) to end of round
(K, K2tog, P) to end of round
(K2, P) to end of round
(K, K2tog) to end of round
(K) to end of round
(K2tog) to end of round
(K) to end of round
Pull thread through remaining stitches and tie off in the inside.
Here's what I did for the celery, but I've seen other ways of doing it and of course you can experiment and do whatever you want.
I used a knitting spool which I made from the plastic center of a spool of serger thread, cutting six prongs out of the top. Work the stalk on the spool until it is 4-5 inches long or whatever length you want. Then, transfer the stalk onto one of the #4 dpns. Do this by putting the needle through the loops, alternating between one side of the spool and the other, so that you flatten the tube rather than opening it.
Knit across, increasing through the back row of each stitch. You should now have 12 stitches. Purl across.
Work with only the first four stitches, leave the last eight on a stitch holder or spare needle. Work the first four stitches, increasing until your leaf is as wide as you want, then decrease and cast off. Do the same with the middle four, then the last four. I don't remember exactly what I did for increases and decreases but I don't think it's too important.
Tie off all the loose ends and pin or stitch the celery to the hat.