Customizable Structure Colors

I think it would be great if I could put a structure down and change its color/paint to the same color/paint of the existing building I put down.

Ex. I have a mansion room in dark wood, and I wanted to add stairs to make a second level off to the side. I wanted to use corner stairs but the only color I could find was light stairs and the options I can switch it to doesn't allow for me to make them dark wood!