Here are a few examples of mixed metals I have found on Etsy. I have these in my favorites list and kinda stare at them every day, like a kid who looks longingly in a toy store window.
This is a chainmaille bracelet made by MBOI (http://www.mboi.etsy.com/) . I love chainmaille, though I don't have any jewelry that has chainmaille in it. It reminds me of knights of Arthurian times, who wore chainmaile with their armor. It is a very epic medium. I love this bracelet because of the contrasts of the brass and the silvery steel.
This set of rings was made by kateszabone (http://www.kateszabone.etsy.com/) . There is a mixture of rose gold, which is beautiful pink, sterling silver, and yellow gold. Put together, they make a soft yet strikinng combination. I love how they have a hammered texture as well. They are simple~ there are no glittering jewels, and I really like that. They let the beauty of the mixed metals and the texture shine.
This stoic bracet is handcrafted by TammysTreasureChest (http://www.tammystreasurechest.etsy.com/). Not only do I love the mixed metals and its rustic appearance, I love the fact that its a cuff bracelet. I am am more into big chunky pieces of jewelry that I can wear often thatn the more delicate pieces. This utilizes brass, silver and copper. There is just the right amount of contrasting colors in this scheme.
In celebration of my new found fascination with mixed metals, I sat down at my own beading desk and created a simple pair of mixed metal earrings. I've taken beautiful brass daisy bead caps and accented them with a white freshwater pearl. I have contasted the bright brass with elongated sterling silver earring wires.