Races of the Wild has this exotic weapon, although they are really bad as weaponry unless you fly (Raptoran) and are using two of them. And then they are still pretty bad imho.
EDIT: If you were to make ice skates a weapon, they would probably be an exotic weapon (ice skates are not a regular weapon that the classic fighter trains in), and deal at most 1d6 damage (akin to a shortsword). You would basically have to incorporate ice skates into a regular attack routine (possibly with ranks in jump and/or balance and/or flying) before anyone plays it from a crunch perspective.
What would Brian Boitano do if he was here right now?....