What about doing it at home and having a garden or tea party theme? You could make straw hats as favors and decorate in pink and blue. You could make a collage of baby photos of the Mom and Dad to be and use it on your buffet table and keep the menu simple. See how this idea was used for a bridal shower: http://www.thriftyfun.com/tf23126917.tip.html and adapt it accordingly. Could be very cute and lots of fun.