dark colors will tend to make it 'older' looking. Perhaps you could audition smallish borders of dark blue, darkish purple and a third color. I have a weirdness for balance, so I would use a fourth very thin border (maybe white) for the first border to frame out the work. I would do this because you have 4 pieces in your rail fence. It would also make it quite a bit larger by having the 4 borders. I'm in my 60's and think it is a very nice quilt. I would love to show it on my bed! I love the idea of being able to periodically change out room accessories to make the room fit the quilt.