Simple squares with a magnetic backing that can be arranged to form murals which can also be changed on a whim were a hit last week in Valencia. Going by the name of Pixels XL and created by design studio CDRoig, the colourful squares are placed on walls treated with metallic paint of any colour. The idea behind the "pixels" is that it should be easy to transform the walls of a living space without too much fuss or muss. By using magnets, there is no need for nails or adhesives that will damage the walls. All it takes is a smooth surface.