Le Corbusier designed a set of paint colours in 1931 and again in 1959 for Swiss paint company Salubra, which he called his Claviers de Couleurs (Colour Keyboards). The paint swatch palettes incorporated a systematic means of co-ordinating matching colours via moveable pockets and windows. This meant a fool-proof method for creating lovely colour chemes for even the least design savvy client.
The colours themselves are beautiful and unique.
Click on the image below to have a look at an online version of the Colour Keyboards.