Blanket featuring a lovely patchwork style panel interspersed with garter stitch and edging is also in garter stitch. Materials and sizes as follows:

Materials

300g Chunky yarn (US: Bulky) and

6mm needles (UK 4, US 10)

Size: Approx 26x22 inches

OR

200g Aran yarn (US: Worsted)

5mm needles (US 8, UK 6)

Size: Approx 28x22 inches

ALSO: 

If you knit the chunky blanket using DK yarn, it fits a car seat nicely (approx. 18x18 inches