I don't know what is ment with the question - because in four days there is one about my fave liquid liner - so I asume maybe khol pencil is ment with it.
For khol pencil - don't use any for years, I don't like how my eyes look with it - I own a few classic colors like black,brown,white - and some funkier colors like turquoise,blue,green,lilac,.. but I just use them on my lid and not on my waterline - so it's again more of an eyeliner.
You see not that many, and quite classic colorrange.
In general I absolutely prefer gel-liner, trying some brands at the moment and need to re-buy MAC's Blacktrack and get Dipdown. Fave at the moment with what i got at home is the Catrice gel-liner "brown" that comes out quite black on the lid.