M.S.
For centerpieces, I got baby pictures of the mother-to-be, father-to-be, and grandparents. I made a cute picture bouquet for each table.
Here is a link to a photo holder so you can understand what I am talking about!
http://www.amazon.com/dp/B000KPJEZC/ref=asc_df_B000KPJEZC...
The pictures made for great conversation.
For favors, I had cookies made and put them in cellophane bags with a thank-you note attached. (The cookies double as a dessert.)