plasticine game - you give each guest a small roll of the stuff and give them 5 mins or so to make what they think the mums baby will look like.....you get some great ones....and some really not so great (but very funny) ones too....

Guessing game - Get a piccie of the mums ultrasound pic. Put in a photo frame with a white border around it. Get everyone to write down the ETA: time, date, weight and sex. Its lovely for the mum to keep, put in babys room and keep forever.....its also nice to find when baby is born who was the closest !!!

Also, google baby shower games....there are zillions out there !!!!