Use an oversized urn with a sprawling palm tree. A 19th century Victorian Hall Tree in the right home would be beautiful and functional. An antique store would be the best place to look for a piece like this or better yet an auction or estate sale. Use a pair of corbels topped with marble or a pair of iron supports topped with glass for a shelf to hold a vase of flowers, keys and mail.
If your foyer lacks architectural interest, secure an oversized decorative wall shelf or bracket on the wall directly facing you as you walk through the door. I like to place them on the wall at least five feet high or higher depending on ceiling height. This is a great place to display an elegant antique vase or urn. In a less formal setting you may want to display a simple pot of trailing ivy to add softness. This is also a great idea because it keeps your floor space free of clutter.