Colors help enhance mood in the interior space, and at the same time, serve to put an accent to objects in relation to each other. Bright colored pillows can easily be spotted from across the room when set against a sofa with demure patterns and colors. Fabric, texture, and pattern of throw pillows, when matched carefully, can improve the visual appearance and general vibe of the room. To further kick up the room’s vibrant ambiance, you may mix and match different sizes of throw pillows to provide better visual interest. The best feature of having throw pillows around is its comfort or the “smoosh” factor. Soft, downy or comparatively firm pillows soften the look of edges or hard materials, balancing the elements to create a mood of coziness to make lounging so much more inviting.
http://www.pillowperfect.com/blog/decorative-throw-pillow-covers-help-improve-homes-overall-vibe/