I have a very open design house, so all the colors have to get along. Don't concentrate on getting necessarily the same color, but the same tone to the colors. You can see all rooms on my first floor, as well as the upstairs hall, from just about any spot.

My kitchen is the only one that breaks the same tone rule, it's brighter, which I don't consider a problem since the rest are the same tone, but different colors. The living room is called 'Nurture', and extremely light jade green; the dining room is a light rose, and the front hall, upstairs hall, and family room are all 'magnificent mocha', a light taupy color. All these rooms read the same tone and you don't really register the difference in color unless you're actually looking at them. The kitchen, which has a large opening to the family room, is sponge painted a kind of light, bright granny smith apple green. My cabinets are maple, the floor is a natural stone/slate colored ceramic tile, and the countertops are gray. Don't ask what color the first floor powder room is; it makes no sense with the rest of the house, it's closed off and I had fun with that one!

Experiment, buy samples and paint them together on a practice paint board (I used a discarded piece of drywall), and have fun!