When shopping for a Persian rug for your foyer, consider these factors. First, decide on the size of your entryway. A good rule of thumb is to select a carpet about two-thirds the size of the room. Next, choose a style that complements your home's décor. For example, consider a rug with traditional patterns like floral and medallions if you have a conventional set. If your style is more modern, seek out geometric designs instead. Depending on durability and ease of care concerns, you can also choose from natural fibers like wool or silk.