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"Huge number of unique identicons"? Since they all seem to be symmetric, there's only N * 2^15 = N * 32768 of them (N = number of colors).

FWIW, there are 360 possible hues, 20 possible saturation values, and 20 possible luminosity values.

So, 1000 times more possible identicons than users. 360 * 20 * 20 * 32768 = 4,718,592,000. Github users: ~4m.

I think N is huge. I haven't seen many repeated colors yet.

Colors don't have to actually repeat in order to be confusing.