"But people aren't paint chips! Our skins have a complex blend of colours."
AZ, I think that comment of yours hits on the problem with this whole business of trying to lump ourselves into colour categories. Take that complexity of skin tone, and add to it the complexity of hair and eye color, then throw in factors like personal preferences, the lighting conditions under which we are viewed, the influence of adjacent colors--in short, all the myriad factors which go into how our brains respond to, and interpret, the color relationships we are viewing and no wonder we have trouble plopping ourselves into 6, or 8, or 15, or whatever number of categories the system has decreed for us.
I personally think clearing our minds of preconceptions and looking hard to see what is really there is a more sane approach. If my eye, and brain, perceives a pleasant harmony between the shirt I'm wearing and my face, that color is my color. The "same" color, though, in a different texture or in a different color combination, or when my skin is ashen because of stress or illness may still be satisfactory, but perhaps not as wonderful. A color which I totally reject in a Northern winter might be a "hmm, not bad" in the light of a Caribbean beach.
There will always be some combinations which I feel are disasterous on me, but others may see it differently. I gravitate towards purples, blues, and silvery greys, but take that same purple and mix it with yellow in a print, and I'll start gagging. That purple is, and isn't, in my palette--and only I get to make the call, not a colour theory.
ETA: Ha, I just realized it didn't answer your question "Can eye color be used as a cheat sheet?" Of course, if your eyes sparkle, then wear the color! But know it might be the pleasure you are taking in the color itself which could be influencing your brain--and there is absolutely nothing wrong with that, at least in my books!