What about a race of golem like creatures, that mine with there hands and eat
rocks. the clever bit is the type of ore/gems/rocks they eat, changes there
overall build, which could have fun affects like increasing certain
stats/resistances/abilities. The race could have skills like examine
composite, to check what they are currently made of for exp might say.. you
are 40%stone,20%iron,40% unknown... and this might give small bonuses to say
hp and resistance or whatnot... I know its kinda a large project idea, but
there it is, an idea