Sometimes a kitchen renovation means different floors, all stainless steel appliances, and swapping out pendants for recessed lighting. But if you want to make a strategic update, one of the most reliable and affordable renovations is the use of color. It can brighten or darken a room, make a space feel cozy, or make it feel spacious. As part of a house-wide renovation, Dave and Jenny Marrs, co-hosts of HGTV’s “Fixer to Fabulous,” found a gorgeous blue-gray color to take the kitchen cabinets from dated to eye-popping — yet the color is still subtle and not at all overbearing.