I absolutely LOVE rose gold!! It is by far my favorite jewelry metal, just because of the soft, lit-from-within look that the metal has. The way candlelight softens everything and makes it glow with warmth... THAT is what rose-gold looks like (to me) compared to other metals.
I have a very fair, rose-tone complexion and rose gold compliments my skin tone well. It can be "too pink" and blend into my skin if I'm wearing a short necklace... but as far as rings, earrings and bracelets are concerned, it's my favorite.
Most often, I combine my rose gold with yellow gold because those are the two metals that I wear most often (as white metals look "harsh" against my pink skin and I have allergies to the alloys of most white metals). However, rose gold compliments silver and platinum well!! I love pairing rose gold with two-tone (white/rose) costume pieces for the day, and if I weren't allergic to nickel I would own many two-tone pieces.
Rose gold doesn't seem to work well when I wear red, orange or yellow... but those colors don't look flattering on me, anyway. I wear mostly blue, grey, black, white and neutrals.