i finally got my john pike palette. i am so fucking happy! cry.

i spent three hours filling it up this morning. now i have like 20 empty cotman tubes. i've got 2 empty spaces left though! one warm and one cool. i'm going to fill the warm space with new gambouge (hue probably). any suggestions for the cool space? if anyone here is into watercolor, tell me what your favourite blues are (like more obscure, not ultramarine/pthalo/cobalt/etc.) and no curelean...it's deadly. any mixing ideas? i used up all of my dioxazine violet so PR isn't really an option.