These 'rocks' are made of joint compound and were formed directly on the wall in stages. After each coat dried, I added more compound until I built up the rock. They aren't finished; I will add more color and will use real grout in between the rocks.
By Sandra from Orlando, Florida
thanks everyone for your nice comments. my husband and son are getting tired of looking at the unfinished walls and I don't blame them! I stopped working on it for Christmas and we have been working on other projects but I will continue on it one of these days.