Example.
Paralyze could be a posion that you see drip from the blade. Maybe you could also see some very small rivers of posion running along the blade.
Shock could have some lightning arcing over the blade.
Soultrap could have the same animation that is used for the spell but it would be surronding the blade
FIre could have the whole blade with a orange glow and small wisps of smoke rising from the blade.
Also...
I hope when they release DLC for the game(please fix the glicthes and bugged stuff 1st though) that they look at adding more unique weapons and armor.