They are appropriately called accents.
Although diverse in style, accent chairs are the ideal punctuation mark to create excitement at market and on retail floors. Functioning as perfect color pops, unifying patterns or as that one piece that defines a group, accent chairs are an upholstery category that continues to explode, and there is no shortage of distinctive introductions at market.
Classic blue and a contemporary profile pair for design versatility in Nathan Anthony's Blossom chair.
The Carolina Preserves collection by William Mangum for Klaussner Home Furnishings features a chair and a half shown in contrasting shades of blue.
Source:
http://www.furnituretoday.com/article/568880-Accent_on_chairs.php
