Sword only texture hacks for Marth?

[Sai_]

I like how Marth's model already looks like, but I want variants of his sword. How do I change his sword textures?

I want his sword to have the same height but different textures such as:

Spoiler

 

[Kati]

Brawlbox and an image editor like gimp, fireworks, or photoshop.