To decorate a Krishna idol at home, first clean it with a damp cloth. Then, place the idol somewhere where it can be seen and appreciated. To create a serene atmosphere, make a small altar out of a decorative cloth or tray and add flowers, incense, or candles. You can also dress the idol in traditional clothing or jewellery, or make a backdrop out of fabric or a painting. Finally, to create a well-rounded and visually appealing display, consider adding small decorative items such as statues or pictures of other deities.