I have seen a lot of 'interesting' things at baby showers. Here's some ideas, some good, some bad, but just to get you thinking
Gift for mom to be -diaper cake all the way!!
Games to play- blindfold baby food taste test AND the one where everyone writes down one piece of advice for the mom to be
Gifts for guests - diapers made into little 'purses' and filled with hershey's kisses
That's all I've got for now - if something looks interesting, google it.