Suggestions, please!

I learned just today that my chiropractor and his wife are adopting a baby girl, due to be born any day now. They are over the moon with happiness. My husband and I have known them for years and I'd like to knit a little gift for the new girl. But I don't have time to do something big like a blanket.

So I need ideas. What is a relatively fast and easy baby gift that's also useful to the new parents. I've seen cute patterns for booties and hats, but do those really get used?

Next, what are your favorite patterns and yarns for baby items?

Thanks!