I have been making a bunch of larger baby blankets and, now that I am soon due, I realize that I forgot to make a few blankets for baby in the car seat. Here's just a simple knit and crochet edged pattern that I did up in a night.
Knitting needles: Size 10-1/2 (6.5 mm)
Crochet hook: Size I
Yarn: I used size 4, medium worsted yarn in two complimentary colors.
With needles, cast on 65. Knit every row until blanket is 24 inches long. Bind off.
With hook, sc around the blanket. Crochet 3 sc in each corner to turn.