Okay, so the title says this hat is for Christmas, but we all know how versatile a pattern can be. Because of that, it really can be created in a much less tacky way than the holidays allow - but I like tacky, so here we go.

Materials:

Your favorite DK-weight yarn. I used Red Heart Designer Sport in colors by Candi Jensen in pink, white, and bright green. I love them so much. And the lighter yarn makes for a nicer fabric in crochet. I think I'm done with Simply Soft. Travesty, I know.

4mm (G) crochet hook.

Large-eyed needle for weaving in ends.

Abbreviations (in order of appearance):

ch: chain
sc: single crochet
PM: place marker
inc: 2sc in st
BLO: back loop only

Pattern:

With white, ch3, join.

R1: 4sc into loop; with green: 4sc into loop; with pink: 4sc into loop, PM; DO NOT JOIN.
R2: inc (4x); with white: inc (4x); with green: inc (4x); DO NOT JOIN.
R3: (2sc, inc) 2x, 2sc; with pink: (inc, 2sc) 2x, inc, sc; with white: sc, inc, (2sc, inc) 2x; DO NOT JOIN.
R4: (3sc, inc) 2x, 2sc; with green: sc, inc, (3sc, in) 2x, sc; with pink: 2sc, inc, (3sc, inc) 2x; DO NOT JOIN.
R5: (4sc, inc) 2x, 2sc; with white: 2sc, inc, (4sc, inc) 2x, sc; with green: 3sc, inc, (4sc, inc) 2x; DO NOT JOIN.
R5: (5sc, inc) 2x, 2sc; with pink: 3sc, inc, (5sc, inc) 2x, sc; with white: 4sc, inc, (5sc, inc) 2x; DO NOT JOIN.
R6: (6sc, inc) 2x, 2sc; with green: 4sc, inc, (6sc, inc) 2x; with pink: 5sc, inc, (6sc, inc) 2x; DO NOT JOIN.
R7: (7sc, inc) 2x, 2sc; with white: 5sc, inc, (7sc, inc) 2x; with green: 6sc, inc, (7sc, inc) 2x; DO NOT JOIN.
R8: (8sc, inc) 2x, 2sc; with pink: 6sc, inc, (8sc, inc) 2x; with white: 7sc, inc, (8sc, inc) 2x; DO NOT JOIN.
R9: (9sc, inc) 2x, 2sc; with green: 7sc, inc, (9sc, inc) 2x; with pink: 8sc, inc, (9sc, inc) 2x; DO NOT JOIN.
R10-30: work even, continuing spiral, pausing at the end of your last pink row;
R31: with your pink color, sc around in all the other colors, joining to first pink sc in row.

DO NOT BIND OFF.

Ribbing:

R1: Ch 7
R2: Sc in 2nd st from hook, sc in next 5 sts (6 sc), sl st into next st on hat, turn.
R3: 6 sl sts across in BLO, ch1, turn.
R4: 6 sl sts across in BLO, sl st into next st on hat, turn.
Repeat R3-R4 around hat; join with sl sts.

BIND OFF. Weave in ends.

Word of Caution:

Make sure to keep track of your yarn, as it's easy for them to get tangled during this whole process. I wasn't paying attention for the first good half of the project and then wasted 15 minutes untangling everything - it's really not a good use of time. Spare the three seconds it takes to move the balls around when switching colors and save yourself many hassles :)