Whether it's simple quilts, kilims, ethnic patterns, or western florals adding colorful textiles add character, make spaces look better, and more inviting. Patterns are also easier to live with. They will age better and they will hide any fading or subtle stains, making them also a very practical choice. The human animal also must find patterns cozier, homier, and appreciate the visual interest since most cultures around the world preferred to decorate with patterns rather than solid colors.
Image 1 from urbanoutfitters.com, image 2 from Tamar Schechner's flickr, image 3 from anthropologie.com, and image 4 from elledecor.com