One of my favorite ways to use up stash fast is working on projects where more than one strand of yarn is held together while you knit. This is an easy way to make a heavier weight yarn using what you have, and it can make fun effects in your project when you use two (or more!) different colors at the same time.
You can use two yarns held together on whatever project you want as long as you get the correct gauge, but if you’re looking for patterns that were designed to be worked with two strands held together, here are a few patterns to get you started.
If I haven’t been giving you enough patterns to use your leftover sock yarn, the Scraptastic Stash Busting Blanket is definitely the way to go. Designed by Samantha Johnston, it’s a bias knit garter stitch blanket, and you can use two strands of sock yarn held together, or try sport weight held double, or DK or worsted held single (I think maybe DK and sock together would work too). The gauge doesn’t have to be perfectly consistent and this blanket can be as big as you want to use all your leftovers. Grab the free pattern on Ravelry.
Another project you can make with lots of different weights of yarn is this headband from Skeinny Dipping, which is also free on Ravelry. The idea is to come out with a super bulky weight so you can use that alone or combine two or more of any other weight of yarn to make a similar thickness. And because it’s worked from a short side it doesn’t matter if you get gauge, it might just be a little wider or narrower than the one shown in the pattern.
Hold two strands of worsted weight yarn together to make these cozy fingerless gloves, a free pattern on Ravelry from Alisa Hartzel. This comes out to a bulky weight, which makes them super quick to knit and warm to wear. They come in one adult size.
Or try the stash busting Happy Hat from Soly Mossy, which also uses two strands of worsted weight yarn to make it cozy and scrappy. These look really cute even when you’re using a bunch of odd balls, but you can make it more harmonious if you like.
Another great thing about holding two strands at once is that it can make projects more durable, like these dorm boots from Kriskreafter. There are options for men and women, and they’re worked with two strands of worsted weight to make them a little more padded but they also should wear better this way, too. They’re knit flat and seamed and the designer says they can make one in a couple of hours.