Just restrict colors to paintable surfaces, fabrics, and accessories that can be easily changed. You can never go wrong by designing substantial storage into a kitchen. Walk-in pantries are always appreciated. Include a few outlets in the pantry at counter height and you can turn one shelf into an appliance counter. Add a window, or perhaps a second sink, and it can become a butler's pantry with a work station that will accommodate another cook.
Good planning is important when it comes to storage.
Often-used items need to be easily accessible, while seasonal serving pieces can be tucked away in a more remote location. Retrofitting those items is generally pretty simple if the balance of the kitchen works well. The space for the trash compactor can be redesigned for pull-out recycling bins, and most appliances can be replaced with little or no cabinet adjustment. However, if the refrigerator is located in the wrong place to begin with, it's still going to be in the wrong place no matter what color it is. And if the countertop is royal blue laminate, it may be difficult to work into a new color palette.