This is the celebration of Holi, the Festival of Colors, in Kolkata, India. Holi is celebrated to welcome Spring by splashing colourful paint, powder and water. Where people have a strong connection to colour you also find it reflected in their homes.
Inset is a picture of a beautifully decorated clay thatched home in Kolkata. It’s a wonderful and delicate example of Alexander’s pattern language No.249, ‘Ornament’ [http://naturalhomes.org/fb r.pattern].
The colours used in many parts of India are unsafe but natural colours are available for the festival:http://www.e-coexist.com/p roducts/holi/ingredients-o f-natural-holi-colours and you can use the same ingredients to colour clay.