It should be a place you love to be. Whatever you need to do to achieve this will create sheng chi. Mirrors and plants are very auspicious. Mirrors activate the chi. Place them so they bring beautiful views into your home, I don't think that putting them on the ceiling above your bed counts.
Plants also attract chi.
Unless they are dying. If you can't take care of plants then try fresh cut flowers. In decorating use odd numbers. 1 Odd numbers are lucky and also make nice arrangements. This is what Martha doesn't want you to know.