Dwarven earth-mother stuff is golden.
Take a look at my deity-a-week thread and you can find some general stuff on Denaari, the dwarven goddess of nature, who also has some revolutionary aspects.
I would shy away from runecraft -- runes imply language which implies civilization which implies cities and thus is associated with things that Druids generally don't like. You could make it work, but I would try a different path.
Think of a farmer of fungus, a dwarf who isn't affraid to go outside, perhaps one near the surface who kept a little garden. Again, the earth-mother cult ideas are superb, with motifs like the earth being the birthplace for all creatures, just as it births the plants. You could also associate it with death, being the place to which all souls are given at the end of their lives. Being a dwarf, it would be only natural to associate it with metals as well...suddenly you've got a druid who isn't affraid to dress richly and buy the more formal comforts of life, who sees the refining process no different than carving a spear, and whose power over earth, fire, and metal is to be rivaled by none.
Those are some ideas. I like the idea of a dwarven female revolutionary inspired by Danaari in my deity-a-week thread (check the sig if you're curious).