Here is a collection of Mini-figs in 20 different colors.
I started this color hunt a few years back in 2001, when I visited LEGOLAND CA.
I met Bill Volbrect who worked in the Model Shop. At the time he had about 10 different colors.
When I got home I started to dig through all my Mini-figs.

I had about 14 colors and none were complete.
I also began looking for sets that had blank Mini-figs parts.
Now some would say why dont you just use Braso and take the print off.
Well part of the hunt is to get the Figs in sets that dont have print.
So some times its a waiting game for LEGO to make figs with no print.