Over on my homepage I discuss how my meditations use subconscious visuals and phrases to deepen your meditation experience. I use The Blue Flame meditation as an example of how this works. Here is an excerpt from the homepage:
A few minutes into The Blue Flame you hear the guidance, "Let your mind be like a drop of red ink that falls into a huge pool of clear blue water."
Consciously, this line assists in your relaxation process. It helps you to imagine your mind being something that slowly opens and goes from red, a color often associated with intensity and even anger, to the color blue, a color associated with serenity, the sky, and the ocean.
On a subconscious level things get more interesting. When you first hear this line your subconscious might associate the pool with your soul or spirit. And so as you see the drop of red ink dissolve in the blue pool what you get on an inner level is your mind opening and dissolving into your aura or energy field. This helps your mind to no longer feel like it has to be in hyper drive, controlling everything, but instead opens it up and allows it work with your heart level, your chakras, and so on. This will help you to ease out of separation and return to wholeness, allowing all aspects of yourself to work in harmony.
The Blue Flame is my second highest selling meditation (the first being Ho'oponopono). It was featured on the Insight Timer meditation app, and below are some comments that were left while it was on there. The mp3 of the meditation is 17 minutes long, and available for purchase for $4 here.