I believe it's from the rug company.
I did a similar style, made to order rug, with wool & silk cut pile, you can learn more at http://www.amararugs.com/rug-collections.html below is a yellow rug which we used in a recent project.
In this great bedroom the classic, modern lines of the beds and nightstand are softened by the splash of citron everywhere. Without this powerful color or coordinating accessories, the space would feel more minimalist and not as interesting. Throwing in a punchy color is one easy way to soften modern details.
