i like the games that are not so formal & that can be done while everyone visits.
1)everyone gets a baby pin when they arrive, if you get caught saying the word "baby" then you lose your pin. the person at the end of the shower with the most pins wins.
2)let each person guess how big around the belly the mom to be is. i like to use string instead of toilet paper so the mom can keep it in the baby book. the person closest to the actual measurement wins. This takes a while to do so it helps to have one of the hosts do this casually throughout the party.
3)let everyone write messages on diapers, like, "#1 0r #2?" or "pfffft..." or "#1 Mom & Dad". That way when they are up at 3 am changing a blow-out diaper, at least they can get a laugh! words of inspiration are also nice like, "keep up the good work" and "i love you Mommy"
4) if they haven't decided on names you can come up with some. some are funny, but i had a friend actually consider one that someone came up with.
5) baby bingo. give everyone a grid with about 16 squares and have them fill in items that they think the new mom will receive. as she opens gifts, people can mark off items. the 1st person with 4 in a row wins. this is great because it keeps people interested during the gift opening time.
hope this helps!!
i like games similar to these because it gives people conversation with those they don't know without breaking the flow of the party.
liz