Can you post a pic?

I don't have any photos I could show you, but my son's home has a kitchen that opens up into his family room, and they used two different colors very tastefully. The family room is a blue color with a grey tint to it, and the kitchen area is a greyish green. I don't know the names of the colors, but the overall effect is lovely. They used the line of the back splashes underneath the cabinets as the dividing line between the two rooms. I think this can be done if the colors are complementary to each other as theirs are.

Right now the rooms are completely gutted down to the studs. Basically the entire space is approximately 13' x 40', about half of the space will be used for each room (13' x 20'). On one of the long 40' walls, there is no real defining architecture that would visually separate the two rooms. There won't be a backsplash or wall cabinets on that wall, just a row of windows over the counter. The only thing I could think of (and still keep it open) was to install molding, otherwise I would have to paint both rooms the same color. I'm doing a white kitchen and was considering white walls, but didn't want to use white in the family room, but was hoping to warm it up a bit more.

We took out our half wall between the kitchen and FR but left short 2' wall because we needed a wall for an outlet and the central vac outlet. At first, I was a little bummed, but now I like it because while the rooms are open to each other, they have some separation. I painted my kitchen a bolder gold color and the FR a lighter gold. We also didn't remove the wall coming down from the ceiling, I can't remember exactly why, but I think it was because we thought the short 2' wall would look odd just sortof sticking out. I wished we had trimmed out the opening, but we couldn't find the same trim as the rest of the house, and it was adding up in costs, so we just left it untrimmed.

I love the before and after pictures of my kitchen. It was so god awful and I have to take all the credit for that lovely garden wallpaper!

Before:

Caroleoh - thanks for posting the photos, it's really helpful to see what other people have done. I love the way you opened up the two rooms.

Here's ours (although I don't know if this will help you since we do have a break where we could change the color). We used one shade darker on the color strip for the 2nd coat in the family room (but I sometimes wish I'd gone one more shade darker). Good luck!

We put in a header to divide the space and used 2 different paint colors. I'm not sure if it will work for your floorplan, but here's a pic( sorry for the mess-still under construction).