Advice needed.

I have dark brown panelling in both my kitchen and "entry room." (it's an L-shaped room at the front of our apartment with a brown computer desk and two brown bookshelves.) I'm okay with all the brown now that I'm finally used to it, but I have quite a few pictures and prints that I'd like to hang and I'm not sure which color of picture frame to use. My brown frames looked a little odd and black doesn't really match up with the rest of the room. Those are all I have, but I wanted some suggestions before I decided to buy new frames. So in your opinion, what picture frame color looks best on dark brown walls?