Baby blanket pattern question

I have looked everywhere for a baby blanket pattern that I really like and cannot find one. So i’m wondering if I can use k2,p2 ribbing for the entire blanket? Will it lay flat? I’m making some socks using ribbing and I really like how they look but not sure how it would work for a blanket.

K2P2 rib will not curl like stockinette but it will pull in a lot. You will need to make your swatch using K2P2 rib so you can determine exactly how many stitches you need to cast on to get the size blanket you want, while taking into account how much it is going to pull in.

Personally, I think that K2P2 rib would make a nice cozy baby blanket.