S.M.
At my shower we did a 50/50 drawing and something similar to football squares but with baby length and weight. Half of the money would go to mom and dad to help with expenses and half would go to the winners. Also we did a diaper raffle, each person who brought a package of diapers (and they were informed on the invites) was entered into a drawing for gift cards that I purchased. I think I got one for Target and one for Outback steak house, each for $50, but if you add up the cost of all the diapers and what I spent on gift cards it was totally worth it.
My family and friends really like to gamble so these non traditional games were fun for us. Just an idea.