Customizing weapon sprites?

[The Legendary Joe]

I'm kinda curious. Seems like a lot of the earlier weapons have their own unique weapon sprites (Mighty staff, Stunner on priest, chains on acos and priests) but then gravity got lazy and left the vast majority of equips with a generic sprite when the characters are in a battle stance.

I don't think I've ever seen a server customize their own weapon sprites for the attack animations. Has anyone ever figured out how to change that stuffs?