Last time we went to see Debbie (mum-in-waiting), I forgot to take my crocheting with me so she handed me a basket full of granny squares and said "here you go". I spent the afternoon crocheting them together with my usual slip stitch in the gap then 3 chain to the next gap. It makes joining squares together much more enjoyable when you get them done fairly quickly.
I then brought the joined squares home with me, joined in all the ends - somebody needs to invent a way of doing that quickly! - and then did a 3 row border of granny trebles around the outside. I think it turned out really well considering there was little to no planning of what square went where.
Here's a photo with my slippers showing to show the size of the blankie - not big but fun, bright and will probably be well-loved by baby girl.