Choose the most beautiful color in the universe. Paint all the walls that color but in each case -that is, with each wall – shift it just a little, so that no matter what you do, you can’t get the color out of your mind, because it keeps changing, like Nature. Find fabric in the same color/s and cover furniture with it neatly, not thrown over but tailored. Have some wooden furniture and some good brass objects (because you’re in India). Have some green plants. Have some books. Have plenty of good lamps, not too intricate in design. Avoid overhead lights, they make people look dead, people look more beautiful lit from the side. Have rugs in colors that are NOT the wall color. Have the rugs be bright and clear. Keep them clean. There should be flowers, fresh ones, whenever possible. I envy you a new house in Mumbai.