Hrymr: You can download item graphic mod separately, without affecting game balance. (which by the way is kinda bad - swords are op, axes suck and offensive magick is very underwhelming)
With respect to game balance, I am actually not using much in the way of swords with my current party. The only sword I am using is Mercurio's Blade (although I do have Bloodlust handy), though I may use the giant's blade later in the game. Here are some of the really nice reliably obtainable melee weapons of other types:
Ax: True, they are weak later, but the Bipennis does 7-21 damage and isn't that hard to get.
Mace & Flail: Maces tend to have KO chance. The Disruptor Mace, in particular, is especially nice with 25% KO. Diamond Eyes has 20% Paralyze, and nothing is immune to Paralyze (even undead are affected!). Also, keep in mind that Whips, which are extended range one handed weapons (ideal for a Bishop, since it keeps her out of melee range without preventing her from using a shield), use this skill.
Staff and Wand: Shillelagh has 5% KO and is usable in the off hand. Staff of Doom has high Paralyze (25%) and Kill (15%) chances, and the HP degen can be avoided with an Amulet of Healing (an item that I think is actually overpowered). Also, the Staff of Death can be used by any class, even the pure casters!
Dagger: Stiletto is buyable from Crock, can be used in the off hand, and has 10%(!) Kill. From what I have read elsewhere, that is twice the kill rate that a Ninja would get with 125% Critical Strike, and it's a while before Samurai and Ninja get instant kill weapons to stack with them. (Neither class can use the Stiletto, unfortunately.)
Polearm: Lance has 4% Kill and can be bought in Arnika early in the game. (Oddly, Fighters can't use it; it's Lord/Samurai only.) Sadok sells the Stun Rod, which has 25% (!) Paralyze, along with 75% Drain Stamina.
Meanwhile, if you look at the good Swords, they are nearly all lategame (except Bloodlust, but there's better). Very few Swords have KO or Paralyze. Also, many of the ones on the list are not reliably obtainable.
In conclusion, Swords are not overpowered compared to many of the other weapons in the game.