In a World where there's often more talk than walk with people, it's nice to get away for awhile and just meditate.
That's how I experienced many of my first spiritual experiences (Angels, Spirit Guides, Extraterrestrials, etc).
The astral plane is nothing but endless space, light, and energies.
Visualization is a great way to focus on the energy of healing light. It's my preferred healing method.
Every color has the ability to heal when you visualize them as a healing rainbow. You're getting a full healing "light show".
All you have to do is imagine a rainbow surrounding your aura (body's energy field), a rainbow flowing inside your body from the top of your head to the soles of your feet, and a rainbow surrounding your entire environment for a cleansing and protective environmental "cleanse".
You can call on Angels as well to provide rainbow light for you. Angels don't have names. Just give them a title. Call on an "Angel of Rainbow Light" for instance. It's the thought and intention that brings them in an instant! Try it out. :)
Heal Yourself to Heal the World. It's a direct link. ;)