Don't give up the grapes! I have seen many kitchens that use the grape theme and it always looks nice. The one thing about a themed room, though, is that you don't want it to become too theme-y. You have just done a beautiful kitchen remodel -- don't overclutter the space with accessories to bring out a theme. I've seen this done time and time again and it makes my head hurt!
I like the valances, I just don't care for the grapes on the top that go over the valance rod.
And we have friends who had a room with a yellow walls and one orange accent wall and I loved it. That's why I like playing around on that site. It gives you a lot of options to try out!