Hi,
I mixed chrome and satin nickel in my bathroom. In my case everything in my tub is chrome. I have a Gatco TP holder that is satin nickel and chrome and a robe hook....it's from the Latitude II set. Type in a search to see a pic of it. I got mine from CSN stores. My sconces are satin nickel and black and then my faucet on my vanity is satin nickel with white porcelain handles, and I put in a white porcelain apron front sink. I like the mixed finishes. They blend well to me. It isn't the same as mixing silver finishes with brass, now to me that would clash:)

ps
all my lever doorknobs in my house are antique brass. I thought it would look better to leave the bathroom door handle matching the rest of the doors in the house instead of trying to match the silver finishes in the bathroom with the bathroom entry door and then having one entry door with silver hardware. It may be that I have broken some design rules:)

Are you talking about brushed chrome or nickel. They are two different finishes. Brushed nickel is more popular and easier to find things in.

I don't think there is anything wrong with mixing finishes but I prefer to stay in the same color family. We did a mix of metals in our bathroom, chrome (Moen) in the shower, brushed nickel for lighting, towel bars and toilet paper holder. I found sink fixtures with the body in brushed nickel but they have a trim in chrome on them too. For the cabinets the handles I wanted to use only came in worn nickel. Our bathroom leans to the traditional side and the mixture still works beautifully.