I love these kind of questions...I can let the designer in me dream on...:P
If your home a different odd-bold color in each room, then I agree with you.
-Its time for some more uniform color in all rooms on the main floor at least. But keeping some color is good for the mood. It contributes to the 'interesting' aspect. :)
-I'd stay away from stark white. Go with any of the thousand shades of off-white or cream. Stay away from the shades that tend to look like a washed out yellow as well. :)
-Keep any one wall on each room as an accent wall, and select a bold, or a nicely contrasting color perhaps. You can select the wall that you wish to highlight and paint it a different color. Of if you don't want a particular wall in color, then go ahead and contrast the archways and window trims, or crown moldings, if you have any. Try imagining in your mind what you'd like, and go for it! Choose the color that goes well with the furniture and layout of that room.
-Bright yellows, olive greens, tan-orange, these are warm inviting colors for a kitchen. Live your dream. :)
-Keep the passageways (both on the main floor, as well as a second floor or basement, whichever applies to your home) uniformly muted, as it would perhaps feel like a continuous flow throughout the house). Beige/off-white/tan, similar shades.
-Bedrooms, all yours...:) personally, I like blues and greens and lilacs in bedrooms. With white curtains. :)) I'm going to pray when my daughter grows up she doesn't paint her room a candy pink.
I'm reeeaalllly wishing I'd get my own home soon (maybe next couple of yrs) when I can start all my adventures...
Good luck to you!!