Knit with leftover yarn
Designs made for several colours and small amounts. Stripes, colour blocks, mosaic — garments where one ball here and half a ball there is not a workaround, but the whole point.
Want to try one first? When I Need a Friend is free. A striped mohair sweater with embroidery, knitted on 7 mm needles — and a good place to start if you have a basket of leftovers and no idea what to make from them.
If you have no leftovers, Garnspesialisten takes in surplus yarn from the fashion industry — lots that would otherwise have been left sitting. One lot, one colour, rarely quite the same next time. That suits the way I work.
What matters is not the brand, but the gauge. Hit that, and you can use the yarn you already have.