Customizable Onesies Two Sizes Available in thelittledabbler Etsy Shop, $2.50+
Fly Away Airplane Baby Shower Games Word by MKKMDesigns on Etsy, $15.00
Assign each guest a letter in their invitation. Have that guest buy their designated wooden letter and decorate it in a fun way. If you have at least 26 guests and they all do it, you can make an alphabet wall in the nursery or play room with all their fun letters!
Buy mom a piggy bank, wrap it, and put it with all the gifts. When mom opens the piggy bank, pass it around and everyone puts whatever money they have on them in the bank. Then all the money goes to the new mom! The piggy bank pictured is from Target for $15: Baby Piggy Bank by Pearhead