It is common to think of colors as “warm” or “cold”, “exciting” or “relaxing”. The Russian-born painter and musician Wassily Kandinsky spent years painting abstract compositions, looking at the work of other artists and making note of the effect color had on him.  However, he had an advantage that many of us do not possess. Kandinsky was a synesthete.
Synesthesia is the condition where a stimulus to one sense provides a multi-modal response. For example, if a person sees the color yellow, he or she might hear a tone at the frequency of middle C. This phenomenon is very well presented in the book The Man Who Tasted Shapes by Richard Cytowic. [ Cytowic, R, The Man Who Tasted Shapes. Cambridge, MA: The MIT Press (1999)]
Kandinsky developed theories of color and form, which not only had specific meanings for him, but were direct links to a spiritual plane. 
Meditation as calibration
Those of us who wish to express our inner feelings do not have the advantage of the involuntary pairing of a sound with a color, for example. I am fascinated and mystified by the process that non-synesthetic abstract expressionists painters use map their feelings to color and form.
I think I may have an answer for myself. Perhaps some kind of targeted meditation would work. Maybe the people who stand for extended periods in front of a painting in a museum, are meditating in some way. Would this process work if I were to look at prints of paintings in art books, or would it have to be in a museum?
My current process
My experiments over the past few days have consisted of three basic steps: 1) drip or spread liquid latex over a 4×6 or 5×7 block watercolor paper surface and let dry; 2) paint the background using a wet-on-wet technique and let dry; 3) peel off the masking material and paint those forms. I am not entirely happy with this process. Painting with drips is for Jackson Pollock or other people who have 40×60 gallery space, not a 4×6 inch piece of paper; preserving the white space should be a result of looking at a painted area and then deciding how to proceed, if visual feedback has any bearing on self expression.
Below is today’s experiment…