How to update a peach and sage green decor?

With the rustic look add a teal blue. Not a pastel but a strong bold . Again my favorite "go to" paint. You can use spray paint on lamp bases. Metal wall art, candle holders, etc. Find fabric in a western print for throw pillows. Find a great area rug to hide the stain carpet. A few items around the room will update the look. depending on your curtains add tye backs of a western theme, maybe horseshoe hooks or rope tied as a lo . Look thru magazines for ideas to incorporate in the room. Remember a little goes a long way.