Boho kitchens mix a calm, practical base with a moment of real pattern, and tiles are where that balance usually plays out. Large format porcelain across the floor, in a wood, stone, cement, or plain finish, gives you an easy surface to live with day to day, while leaving room for something more decorative where it counts.
That's usually the splashback or the surrounds behind the hob and sink, where a patterned or richly coloured tile can carry the whole room's character. In smaller kitchens, pattern on the floor itself works gorgeously, adding personality in a way that a plain surface simply cannot. Given that the kitchen takes more spills and splashes than any other room, a tiled surface is also the most sensible protection you can give it, whatever pattern you choose to layer on top.