One 40th Birthday 7 ft. Cascade Column Decorations. Add a little mystique to your 40th Birthday gathering with this 40th Birthday Cascade Column Decoration. Hang the cascade column alone or the pieces can be easily detached into as many pieces as you like. Pair this colorful cascade column with balloons, crepe streamers and other coordinating party supplies, and you have decorated for one unforgettable party. This is just one of the many wonderful discount party decorations and favors that Birthday Direct has to offer.