I have a budding Arcanist force, and I plan to bind them together like this: Rasputina, my first Arcanist master, and her Ice Gamin and icy creatures are all going to be based on earthy, tufts of grass and flowers bases, with patches of melting snow.
The others will have variations of that theme; the same earhy bases, but more greens and perhaps some shrubbery for Marcus, the odd discarded electrical looking implement for Ramos, the plants will be scorched and smoldering for Kaeris, etc. 'neutral' miniatures will just get the earthy bases with grass and flowers.
That's the Plan anyway, for now, it's just Raspy and her boys getting painted.