For the sport weight version: about 33 yards total of two colors of yarn (I used Red Heart Sport in red and green); a set of size 3 US (3.25 mm) double-pointed needles; scissors and yarn needle
For the worsted weight version: about 30 yards total of two colors of yarn (I used Red Heart Super Saver in turquoise and white); a set of size 8 US (5 mm) double-pointed needles; scissors and yarn needle
For the bulky version: about 12 yards total of two colors of yarn (I used Reynolds Lopi for the gray and Martha Stewart Crafts Lofty Wool Blend for the green); a set of size 13 US (9 mm) double-pointed needles; scissors and yarn needle
Note: I used just three needles for each of these projects, putting half of the stitches on each needle and knitting with the third. If that’s uncomfortable for you, you can use more needles, but knowing where the middle of the round is comes in handy.