Hello Sir, I do not understand- what do you mean by "changing the wall Designs." For coloring/wall papers/textured painting it is better to have finished wall. For wall cladding/tiling it is OK to have a non finished wall as well as they require a rough surface. For changing the tiles, its quite a messy, and wasteful expense. Rather, you can give the tiles of your choice to builder to install on the first go itself. Some builders don't allow such requests but others would happily do so. Some others may even offer a discount for not using their tiles. Same thing with paint as well you can give your colors to them to paint if you are not happy with white. Thanks, Nitin CORNERSTONE DESIGNS Bangalore.

Thsnks, A lacquer spray will give you the desired effect. Please get a sample test on the leftover tile before proceeding on the wall as it will be a permanent thing. Thanks Nitin CORNERSTONE DESIGNS Bangalore

pooja room should be depicted as traditional and ethnic, one can use wooden carved MDF sheets for paneling with duco paint as its finish. other option can be wooden square mesh panel with bells - photo attached for reference. POP niches can be made in dome shape with led lights. niches in the wall, reference picture

It would be better if you can consult Admixtures company like ., Myk laticrete, Bostik ., etc It's a kind of plaster STUCCO...