A steel one would be cool and you can evolve it by trading with the steel coat. I would love a dragon type eeveelution but I can't see them making one.
metaleon for Steel
eeveeon for normal
Aeirleon for Flying
Spookeon for Ghost
Toxiceon for Poison
Draceon for dragon
Muscleon for fighting
Muddyeon for Ground
Stoneon for Rock