My friend is heavily into Warhammer 40K lore and culture. He likes sharp things. He likes the Blood Angels.
All of this resulted in a mad 5-hour modification of this machete. He loved it.
Don't know what 40k is?- http://en.wikipedia.org/wiki/Warhammer_40,000
Don't know what the Blood Angels are?- http://warhammer40k.wikia.com/wiki/Blood_Angels
Here's how you can make your own- I encourage you to make one themed after something else, the possibilities are endless (although here are a few ideas to get you started)
-Assassin's creed knives
-A historical group you are fond of
-For whatever interesting designs you can come up with!
Warning- the methods I use here are not up to my personal standards of perfection! Read the steps before you build it so you don't repeat my mistakes!