They occupy a large part of the room. Therefore it must fit both color and material. Therefore it is good to choose a color that we not only like but also match the color of the plaster for example.
Kitchen cabinets can be made in multiple designs. Some cabinets may differ from each other for example by way of opening. Or they may vary in color. Or by choosing a material. Kitchen cabinets don't have to be united. It just needs to fit well into the room as a whole.
Furniture stores can be found in every city. It depends on what kind of furniture we are looking for. Kitchen cabinets have their own specialty stores. Other furniture is usually not sold there either.