Generally is it ok to paint the Cornice in the house black?

1. It is uncommon, but can still be painted black.

2. Do take note that under the Five Elements concept, water element colours are: Blue, black or grey.

3. In the I-Ching, water symbolises "difficulty". Thus, (not black) but rather, avoid painting the entire ceiling "blue" or tones of blue. As this represents "water" i.e. diffculty.