You can look for some nice pictures of the couple and utilize beautiful decorative frames for displaying them. You might also enjoy the thought of working with the leftover balls and decorations. It is possible to plan and decide the situations you want to use on the table.
Additionally, you may also go for die cut cards. The table will appear crowded and there might not be sufficient spot for the food, cutlery and other serving pieces. Centerpieces made from balloons held at the middle of the table suit well for all kinds of birthday parties.