I love metallic colors, and I love mixing metallic colors.  Its the fun group of neutrals that are way more glamorous and fun than your plain jane black, white, tan, etc.  And yes, contrary to popular belief, they are fun to mix with each other.  No more all gold, or all silver.  Mix them, match them!  Trends these days are a lot more about variety and surprising combinations of color than rigid set of rules.  Try adding a few metallic accent pieces around your home, and see how they can update your space and add just a touch of sparkle!