The perfect mix of patterns can really make a room. I love using patterns and colors in textiles to really pull a room together. While I hate "design rules" sometimes a little guidance can help get you over the hump of designing your own space.
When I'm choosing fabrics I like to start with my "organic" fabric. This could be a floral, paisley, ikat, etc... anything with a non-uniform pattern and more than one color. Next I pick out a "geometric". This is usually a stripe, trellis, chevron- and usually just two colors. I try to pick out a color that's in the organic pattern for my geometric print. Last is a "solid". I pick out a color that I really want to bring out from the organic fabric for my solid. And it doesn't have to be a flat solid. Something with texture is great for adding some more interest to the grouping.
Follow these steps and you'll be mixing patterns like a boss in no time!
A few of my favorites from my favorite sources for fabrics and pillows.