Welcome to Gaia! ::

I can see "hypnagogic" colors when my eyes are closed, which frequently intensify as I meditate, though I don't attach specific meanings or feelings to them. When in darkness, the colors are typically purple/faint yellow/sometimes green. When light is hitting my eyelids, the colors understandably shift toward reds, oranges and yellows. Occasionally I can gain some conscious-control over the appearance of the colors and try to shift the tones as part of a concentration exercise...The appearance of fine points of light (generally white but often rimmed by shimmering rainbow colors) tends to be more indicative of deep meditation for me (though primarily if I'm even bothering to monitor my sight-consciousness).

Conceptually, I will contemplate our experience of the colors (and other phenomena) as evidence of the dream-like Emptiness, utilizing both scientific knowledge and traditional Buddhist analysis. Our thinking/interpreting minds translate the sensory experience of (purported) external objects as having colors, presenting the image of objects of a color that are actually reflections of radiation not absorbed by the object (i.e. the color seen is not even a property of the object in question in the manner perceived, yet the mind presents it as such). Color is a "white lie," a helpful hallucination, that serves to aid us in superficially interpreting our surroundings while fundamentally fooling us as to the true nature of the world. The fact that other people share similar experiences of these colors and talk about it leads us further astray by being taken as evidence of both "color's true existence" and the "true existence of the external world," whether at all or as simply-perceived. Our experience of color is wholly symbolic, and like all symbols, is open to the mind's imposition of conceptual and emotional meanings on it. Hence, we readily associate emotional states to colors and link memories/past experiences to our conceptualizations and experiences of colors.

Colors, and other phenomena, are considered "empty" from several inter-related viewpoints. First, "when thoroughly analyzed, nothing is found," as there is no objective essence, core, or foundation of, say, "Green." The experience of Green can only be described to a third party (say a colorblind individual) in terms of other concepts that are not Green; subjectively "Green is Green" and otherwise lies beyond conception. Green is an example of where "the mind's emptiness is the same as the mind's luminosity," since it is a vivid projection of the mind that, in itself, lacks definition. Second, color embodies Emptiness because it is an example of Dependent Origination; the experience of Green will not occur unless mental conditions for its perception are present/meet according to circumstances dictated by individual Karma; Green has no independent existence and can only "be" due to the meeting of myriad conditions. Third, taking a more-Theravadan line, Green is Impermanent (hence not truly existent), because one's perception of a green object will not impart a permanent green mark in one's vision; the perception comes and goes. Furthermore, one's conception of Green is Impermanent since you doubtlessly change what green hue most represents Abstract Green over time.

On a happy note, anger, sadness, and other afflicted emotions are just as empty and impermanent as "Green" and cannot forever harass you, let alone even touch your Buddha-Nature. This thought should help in your meditations as you struggle against the negativities in your life and mind. If you were perfect and not struggling with suffering, you would be a Buddha and not a Buddhist!