Here are 10 gorgeous baby shower cakes to draw inspiration from if you're stuck on a theme. Any of these can be modified in the colors of your choice, or made gender neutral. They could even become gender reveal cakes too!
15 Entertaining Baby Shower Games via Pretty My Party I really like the "don't say baby" game, the "guess how many jelly beans in the bottle", and maybe some others. But those two are fun and require minimal effort.