Use all your scrap yarn and minis or one, two, three colors of fingering weight yarn.

Techniques used:
Slipped Stitches
Provisional Cast On
Kitchener Stitch

Samples:

Multi by Republic of Wool (last 2 photos)

Red and Multi By The Flying Kettle
On this cowl I played around with the slipped stitches and knit plain stockinette on 3/4 of the body.