Pretty banquette, huh? Fooled you, it's a settee against the wall. Here's an amazing alternative to a pricey, custom built-in. With the proper scale, a sofa or settee can work beautifully at a dining table. The biggest objective is to ensure it's easy for guests to get in and out of. If the piece is roughly 24 inches longer than the table on each side, that should do the trick. Also, stick with settees that have low-slung arms or that are completely armless.
http://www.ballarddesigns.com/parker-settee/furniture/sofas-loveseats/172160