Some very good friends of ours recently had their first child, a son named Reuben, and this is the blanket I made for him:

It's a very traditional granny square crochet blanket, I love these because I can take a ball of wool and a hook with me to anywhere and just make another square or two when nothing else is happening, but I never have to carry around the full project until I'm assembling it right at the end. The border is one round of trebles and another of double crochet - as simple as anything!