Here is one blanket my friends and I made. My dear friend Steph. (It's all purple!)
Bev's Seed Stitch Square Size 9 needles (5.5 mm)
Cast on 33 sts and work 3 ridges (6 rows) of garter stitch. (should be 9" across)
Next Row: K3, *p1, k1; rep from * across to last 4 sts, p1, k3.
Rep this Row until square's length is 6 1/2".
Discontinue pattern stitch and work 3 ridges (6 rows) of garter stitch, binding off on last Row.
You can assemble the squares with a whipstitch. No need to add a border, but you can crochet one if you wish.
Here are some knitted borders: