indus valley civilization

I believe it was mostly mud and mud bricks. This is off the top of my head, but I seem to remember their houses were all of a distinctive rounded shape. You'd need something that's pliable when applied but that dries hard.

Assuming that you mean the ooooold (original) civilizations on the Indus, here's a helpful link. Have you been checking out google?

http://www.harappa.com/har/har0.html

or more specifically, try here: IVC

Great site, littlek!