Another Pinterest idea I have been using lately are these baby wish cards. They are a free printable I found on pinterest, and they are available in 4 different colors:
I print 2 to a page on cardstock, and cut them out for shower guests to fill out for the baby. And as a special surprise (that is sure to get some tears) I have been secretly having the dad-to-be fill one out for the baby. Then I frame it and give it to the Mommy at her shower. So sweet!
I also made a set of these name blocks for the shower. They are pretty easy to do, and the can be used in the baby's room after the shower. I like to decorate with things that are re-usable in the nursery later. That way all my craftiness doesn't go to waste!