Opal is a stone of inspiration which enhances imagination and creativity. It can bring inspiration to projects and to life and Spirit. Its own spirit is at times like that of a child spontaneously playing, dashing color where ever it  pleases. Carrying this imaginative spontaneity into the realm of you life can bring strong creativity.
In the psychic or spiritual realm opal is used for high spiritual crystal energy vibrations. It is said to be able to help one be "invisible" in situations where one doesn't want to be noticed. This could be used in astral journeying as well as in daily life. It is also said to be able to help pick up thoughts and feelings and enhance them. It is also a protective stone, said to be particularly protective in dangerous places. Opal is used in light work as a stone for strong and safe dreamwork.