You mix metals? YES! I have never shied away from the mixing of different metals to complement each other. Metals are organic elements after all and they offer instant warmth and elegance. Most often, kitchen spaces include a stainless finish in appliances, but this doesn't mean that stainless takes front and center. Have fun using stainless with polished nickel and/or brass and even incorrporate precious stones and shell cabinet hardware to complete the organic look.