I'm all about layering rugs. It's the perfect solution for small or vintage rugs. Can't afford the super pricey 9' x 12' rug, then get it in a 4' x 6' and place happily over an inexpensive sisal.
Vintage rugs are notoriously small or oddly shaped, so onto a large sisal they go. The bigger the underlying rug...the better! It anchors the space, making it feel grand, yet cozy.
And just for your viewing pleasure, some prime examples...