Two words: Lustre Vision. Li'lilly, Lustreleaf, & Chill Blue get no use because the texture and color pay-off sucks and it's too frustrating to try and get a good color out of them.
Also- dark and bright blues. With the exception of Freshwater (which i use occasionally) these get no love-- Contrast, Electric Eel, Knight Divine. I can't make them work.
And pinks! Why did it take me so long to figure out that I can't wear pinks! I have an ENTIRE palette of these that I never wear. Sushi Flower, Angelcake, & Living Pink are almost the exact same shade-- And I never wear any of them. And the light warm pinks that don't show up on my eyes except to make them look vaguely irritated and unhealthy-- Girlie, Goldbit, Paradisco.
Let's see, what else? Bitter, but I knew that was going to happen when I bought it so I don't feel bad about it.
That's really it, I guess. What I do wear a lot of: my millions of greens, purples, browns, golds, taupes, teals.