Baby shower question. Not sure where to post it. Ideas?

I am going to be a Grandma for the first time, and I am thrilled! We just found out today that it is going to be a girl. When my son first told me the news, he said something about the baby swimming around, and Nemo. The next thing you know, well, she already has the nick name of Nemo, lol. Anyway, I want to give a shower with a Nemo theme, or under the sea. I have some pretty good ideas already, but I need game ideas. All ideas are welcome, and thanks in advance!