How can I make a mature, Paris themed room more colorful WITHOUT looking juvenile?

I really want a mature, Paris themed room, but still have some color. I like the general idea of this room: http://www.swell-group.co.uk/town/paris/ But how can I add more color without making it tacky? I was thinking some gold, navy blue and purple.. would that work? Edit: is purple, black, & gold okay to add?

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