Limewash I suggest for the 12th century for houses, it depends upon the area and the soil, Suffolk plaster is quite red as are the downs, here locally in France in Pays de Loire a wide range of colours exist but predominantly the same colour as the soil, grey beige through to creamy white through to a golden yellow is common in lower Normandy.
In Vitré a 14th century city that has a provision order on it, there are greens, reds, pinks and yellows, although much later. The merchants houses and guild houses are mentioned as being very coloured during the cloth making boom in the 13th century.
Cheers
Matt