I wanted to make a neckwarmer to go with my Beret Pour Vous? And I still had lots of scraps of Koigu leftover from many other projects, but not enough orange to make that the main color, so I substituted purple. It still works.
Here's the pattern, written as though you already know about mitered squares...
Koigu KPPM, less than one skein main color, and lots of scraps of multicolors.
Needles size 3 circular or dpns
Ribbing: Cast on 96 sts and rib in the round K1P1 for ten rows or 1.5”
Knit in Stockinette for 5 rows, increasing on last round: 1 st every 12 stitches=104 sts
Mitered Square (25 sts): With contrasting yarn: Cast on 13 stitches and knit 12 from needle=25 sts, to form the first mitered square. Knit every row, slipping first stitch of every row and on the right side make center decreases (K2 tog, Sl 1, Psso) over the three center stitches, ending square with one stitch.
90º Triangle (13sts): With one stitch on needle pick up 12 stitches from previous square, (13 sts) Knit every row, slipping first stitch of every row and make decreases each right side row by knitting to last three stitches then K2 tog K1.
Make eight Mitered Squares alternating with eight 90º Triangles. Join by seaming or three needle bind off or whatever method you like.
Change to main color and pick up stitches along bottom edge of miters and triangles, 192 sts.
Round 1: K
Round 2:K and make 1 after every 12 sts (208 sts)
Round 3 K
Round 4 K and make 1 after every 13 sts. (224 sts)
Round 5 K
Change to multicolor and cast on 6 sts, pick up and knit one stitch from between stitches on previous row, K6 from needle. 13sts forms the mitered square. Make a total of 40 mitered squares and join as above.
Change to main color, and pick up and knit 240 stitches along bottom edge of small squares. K five rounds and begin ribbing. Rib for 8 rounds. Bind off loosely.
This would work great with any combination of sock weight yarns.