Splashes of bold color because appliances are black, silver, or white and cabinets are dark. Clay colors like ginger, copper, henna, and gold tones too. Bold accents won't look flat.
Hottest trend in kitchen color right now seems to be deep red. I built a house just two years ago and deep red was a color option and I am so pleased with it. I have received countless compliments on the color scheme.
The most recent color trends in kitchens is to use Tuscon colors or colors that would match that of red wines. This would be deep mustards, yellows, greens and reds. However you can go overboard. Be sure not to use to bold of a color or too bold of combinations.