Anniversary Decorations. A romantic birthday party that makes the anniversary even more memorable. This year’s party has everything you need to make your anniversary day one to remember. A variety of different shapes & sizes of balloons, cupcakes, cookies, and other decorations can be arranged in the shape of a heart or swirls. You can decorate it up with some flowers too. There are a lot of other special birthday party decorations that are great for any kind of birthday for anyone.