Thanks for bring up this interesting subject. Let me elaborate about Yin. For colours, the use of light colours. Flooring made of wood pieces will enhance the yin in a room.
Colours are vibrant e.g. bright colors.
Flooring made of cold slabs of e.g. marble, homogenous tiles and other ceramic materials especially if they are bright coloured enhance yang in a room. The above is a good example of how furniture and colours are used in food outlets. For lighting, e.g. in a room, if you want more Yang, then have a bit more of light or use a table lamp. Ideally, you should use a table with a rounded corner. So that if a child bumps into the corner, it is rounded and will not hurt anyone.