Im a professional floor refinisher and worked in lots of both style homes. While the walnut transition border isnt exactly the "style" who cares. If you love it and not a huge added expense do it. Even if walnut is not installed you could still stain the oak to imitate what the walnut would do. Its ur home! Just remember that!

Thanks, I really appreciate your comments. Actually, this was a case of my not being sure I liked it, but not wanting to hurt the flooring contractor's feelings, as they were his idea.

I decided not to go with them when I realized that I really only thought they'd look cool in someone else's house! I have to learn to grow a pair!