Assembly for selecting matching colors to base colors of user articles. The assembly comprises a substrate provided with a plurality of selection areas that have mutually differing selection colors. The assembly further comprises a cover having a first main surface provided with a first base color and having a second main surface. The cover is provided with a window. The assembly is provided with holding means for holding the cover to the substrate in a first cover position wherein, by means of the window, at least one selection area is exposed. The second main surface is provided with a second base color. The window and the holding means are arranged for holding the cover to the substrate in a second cover position wherein, by means of the window, at least one selection area is exposed.