Start in the entryway. Very often there is a small corner right by the door that's very narrow. It's difficult to decorate, but would look great if it could be jazzed up. In this case, a bouquet of vibrant colors standing next to an umbrella stand would a nice option.
Consider placing two tall arrangements on a table that sits under an entryway hall mirror. The flowers should flank both sides of the mirror, giving the area both a shot of color and visual symmetry.
Place a tall dried floral arrangement between two chairs in the corner of a living room. Clusters of odd-numbered items tend to look great, so you might stand two tall floral arrangements--each of slightly different heights--next to the floor lamp. The flowers plus the chairs create a focal point for the room.
Remember the built in shelf near the ceiling. Often the space between the shelf and the ceiling is several feet. Flowers, particularly ones placed on the corner of the shelf, act as a bright visual anchor to the space.
Design a shadow box using tall dried flowers. It's still a floral arrangement, but housed in something other than a vase. Several shadow boxes with dried flowers of various lengths in a picture gallery offer a different look than would otherwise be created by just hanging pictures alone.
Take the arrangement outside. A sun porch is a natural choice for dried floral arrangements. Already so close to nature, these spaces benefit from bringing a little bit of the outdoors inside. As with the living room, a tall arrangement looks great next to a corner chair, but it also adds height to displays made with pumpkins and gourds, gardening tools and other items made for the great outdoors.