Try a Little Bit of Pattern
Pillows are noncommittal, making them the perfect accessory to try out pattern. Start with just one pillow on a neutral chair. Pick a print that adds dimension to the overall space but also plays off the colors already in the room.
Try a Little More Pattern
Juxtapose a patterned pillow with another print that exists in the room. Choose a pillow that has similar colors as the print you are layering against. Mixing large and small-scale patterns keeps things interesting.