Baby Showers are lots of fun, so we are always looking for new ideas! Host an Almost Time for Baby Baby Shower. The keyword here is "time".
Each guest is assigned a certain "time" of day in the babies life; For example, story time, bedtime, bath time, feeding time, changing time, sick time, etc etc. You can just ask the guest to bring an item related to their "time of day" right on the invitation.
The guests then bring items relating to that time including books, bottles, blankets, towels, washcloth, a diaper cake........whatever.