I've taken another step in developing this blue series. It's all about shifting varieties of blue, floating in layers of gel medium.
Today I got paid for the college course I taught in July, so I've made a purchase of some new Golden blues (while planning to use cheap Dick Blick acrylics for larger coverable layers like toning the canvas, as part of my money saving scheme). These new (to me) colors are cobalt turquoise, cerulean blue deep, cerulean blue chromium, and anthraquinone blue.
So I'll throw them into the mix (i.e. the old faithfuls, ultramarine blue and phthalo blue/green shade) and see what happens!