I may be writing a more detailed article about this sometime in the future, wherever that is. Do check back!
There are various things to consider when answering this question, for example: inspiration, vision, embarking on the path of creation, finding the flow within the path, and using technique. While some of these are still a mystery to me, I will outline some of the more tangible parts of my process, which is always and of course subject to change.
Most of my mandalas usually start out with a photograph of nature. I usually take these photographs while doing walking meditation or when going for walks after sitting meditation; when I feel thankful and at peace with everything around. I ask for permission and guidance to see. Not all photographs will become mandalas, just a select few actually click and invite me to play with them in such a way. Some are rather abstract to begin with. I intuitively manipulate these photographs, mainly in photoshop, and play with layered symmetries, painting, sketching, collage, filters, and reflections to portray what the inner eye may see through the particular shape expressed in the image. I then “bring out” or “ground” the main underlying sacred geometrical blueprint and/or mystic symbolism for what could be considered a “mandala”. This bringing forth or grounding of the shapes, symbols and patterns makes what is there a bit more obvious to the untrained eye, while pushing us to see further beyond the apparent with the use of inner vision. Many times I start bringing shapes forth without fully knowing what they are, or how they look. The process of making them visible is similar to a process of remembering, or separating a crystal gem from the matrix in which it grows: you know something precious is there, and you have to go about it bit by bit...
On more than one occasion, I've been led to "discover" that the shapes I paint (or parts of them) have actually been portrayed before, some having histories that span thousands of years. For a tangible example of how my process may function, you can read about how my first mandala came to be.
[Nov 2009 update:] In search of more depth, textures, new color combinations, and the ability to channel my creative energies through hands and movement, a new stage of my work has begun. Some of my more recent pieces include using brushes and acrylics to paint over my giclées. This results in one-of-a-kind pieces, printed either on canvas or Hahnemühle Torchon (a type of super thick, archival, water color paper), which are then painted over using several layers of acrylic paints, gels, transparencies, and iridescent paints. Some examples are "Veil Lifts / Retrieving the Third Strand" and "Hydrogenesis / Hydroenergen". The finished works are later photographed in order to offer limited edition giclée prints.
[Feb 2010 update:] I am now also creating a series of Activation Circuits that are based solely on digital media and digital painting, no photography, and a lot less sketching. These new pieces serve as "focused short cuts" to some of the places and mind spaces that can be accessed via my other work, and to new ones as well. While the others can be akin to the light a bonfire emits, capable of lighting a long stretch of a dark beach, these are more like LED flashlights, and pinpoint specifics. The energy is a lot more focused, and, in contrast to the more experimental-stream-of-consciousness process I follow in my other lines of work, the Activation Circuits are made more succinctly and with a clearer, more focused intention. These pieces are great for quick glimpses and may be easier to connect with. Do not be fooled though, they also have deeper and deeper layers that will unveil one after the other.