Ekhabumi says according to his guru, there are three basic Tantric paths: the red, black, and white. There are many goddesses who are each of these colors.

There are also goddesses that are said to be colorless or Crystal. One got us in particular, Kali, is said to be mirror-like. 

any warm color like yellow, gold, orange, red, these are all associated with the Red path of desire.

any of the of the cooler colors, like blue, black, green, these are all associated with the black past the fear and fearlessness.

White, silver and some very pastel light colors, are associated with the white path of knowing and not knowing or you might say being and not being.

According to Ekhabumi's teacher the basis of all magic is focused attention, so the tantric traditions exploit basic survival instincts to hijack the primitive reptilian survival brain and help to focus the attention of the practitioner. and hence the symbolism of the colors. These colors also correspond to the three Gunas, and the three primary subtle channels of the human energetic system: Ida, Pingala, and Shushumna. This is also why you can generally rest assured that if you see someone painting a Sri Yantra using the colors blue, black, purple, brown or any other dark color in the inner triangular area, they have no clue what they are doing.  Because the goddess of that particular design known as Sri or Lalita AKA Tripura Sandari AKA Shodashi, is a goddess of desire. She is the red path.  if you change the color ofthe magical design (yantra), you change the goddess that you are invoking.