Baby shower ideas for my sea monkey!

So me and my so we're sitting on the sofa doing homework together. And his sister sits at the dinner table along with his mom and ask me if we had any ideas for the baby shower. I say no and then his sister starts rubbing in our face that she wants this and that at her baby shower. Now me and my so are in our 20's. We got don't really have time to think of baby shower stuff cause we are so busy with homework and things. Then me and my so planned it all out within 3 minutes of talking and she has been planning hers for like months... Now when we finished talking she gets up from the table and starts telling his mom how great her shower will be trying to rub it in our face. Now I am 20 and she is 18, I know I should be a little more mature about this but I now want my shower to be better than hers. Lol is it bad that i do? Anyways here's our invitation/gift idea. Any ideas y'all may have would be great. We call our baby sea monkey. Lol so we will like to have a sea theme. Thanks so much-any negative feedback/comments will be reported.