How about having it so they all have beards?
I\'m assuming that you are going for a Dwarf army for Warhammer here. I\'d say pick a Dwarf hold and go from there. I did see some guy with an army based on one of the northern holds and themed them towards being Braveheart style Scottish with kilts, tartan and woad and stuff (you can take our land but you\'ll never take our beer).
Barak Varr is the only Dwarven seaport in the Old World so you get sailors and pirates etc there. There\'s the Slayer one which had it\'s own army list for a while. Or possibly theme one towards mining and mix a few of the miner pieces in with the regular clansdwarfs.
Best thing to do is look into the background untill you spot some gimmick which takes your fancy.