Work through seven balls of yarn in alternating colours in this way.
Fasten off and sew in the ends.
Trim
Use cream. Work a reverse double crochet (crab stich) trim around the blanket. On the sides you will be working in the sides of the dc and bptr and on the top and bottom, you will be working in the the tops of the stitches and the foundation chain.
Once you have crocheted around the blanket once, you can fasten off.
Now you have a wonderfully snuggly crochet blanket.