How to add another color to theme color pallette?
It's starts working when I changed color.module in line 234 (added TRUE param):

$palette = color_get_palette($theme, TRUE);


Caution: This removes any custom colour palette so you might want to note the colour settings somewhere

EDIT

Now I have removed TRUE param from code, my new field still appears and everything is working correctly.

Anyway at last problem is trivial to solve, just disable and enable theme again, but it remove blocks settings etc on this theme.