Sometimes the cool weather comes as a surprise: it's been warm for a long time, then all of a sudden you get a cold snap. When that happens where I live, I want a quick and easy project that will start keeping me warm really fast.
These Quick Arm Warmers fit the bill for just such a project. They're incredibly easy -- just Stockinette Stitch with a bit of ribbing -- and they use a really small amount of yarn. For me this was a one-skein project using a ball I got in yarn grab bag. I actually got three different colors of this yarn (It's called Two in One, though it's been discontinued, it was distributed by Coats GmbH).
I have really skinny arms and small wrists, so these mitts are a little slouchy on me, but they should fit a more normal-sized person more snugly and can stretch to accommodate bigger arms, too. This is a great pattern to have in your back pocket for a quick knit gift.
18 stitches and 25 rounds per 4 inches in Stockinette Stitch in the round
Glove measures about 8 inches around and is about 7.5 inches long. It should fit a range of older girls and women. Need a bigger glove? Add stitches in multiples of 4, each of which will add about an inch. You can make them longer as well, but any increase in size will require more yarn.
Work a second glove in the same manner.