The bright colors of this mod theme are easy to pull off and add a sophisticated touch to a fun theme.
Décor: Think bright and bubbly, but stick to just two or three colors so you don’t overwhelm your guests. Print or purchase removable white vinyl fish decals (find some here) and stick them to glass vases. Fill vases with water and add a few drops of blue food coloring to create that ocean-blue color. Blow up round balloons and tape them to the wall for a big, bubbly backdrop, and serve pearly gumballs, jello "shots," and cupcakes topped with balls of colored fondant for dessert.
Cute idea: Create a "bubble bar" with a prosecco-spiked punch bowl filled with round ice cubes. Find bottles of fancy soda in your color palette, and create your own custom labels for a non-alcoholic choice. (Make sure the pregnant star gets a special one -- non-alcoholic, of course!)