Photos of the couple on different poses should surround the room - posted on the walls, hanging from the ceiling, etc. Since this is a couple bridal shower focusing on activities that the couple will do together, showcasing outputs of their previous projects or just a picture or two of an activity they enjoyed together will be quite cool.
The couple's pictures can still be your table centerpiece, but if you like the idea but wants to put a different twist on it, then go for a caricature or a painting of the couple instead.
We think that a photo, stuff toy, or figurine of an animal couple is really cute and is worth considering as your table decoration. We'll leave you to choose which animal to pick, but doves, dogs, rabbits, and chicks are some of the more popular choices.
Another cute couple centerpiece idea is to get some goodies like cupcakes, cookies and caramel apples to look like the bride and groom. Be sure to take lots of photo of said centerpiece since they're edible and will most likely disappear before the party ends.
Wrap up your decoration by getting balloons which come in the couple's favorite colors and you're all set!