All credit for this post goes to Zombologist.

I found it on the forums and I figured it would be nice to put in a guide, so people can favorite and such.
(Zomb if you want to put this guide to your own name I'll be happy to take it down.)

The original post can be found here.

I haven't seen anyone post a list of voodoo codes yet. so I thought I would take the first step and atleast starting one.
First things first though: An explanation of how they work. Specifically how the games system works to my understanding.

The voodoo code system uses a 6-digit numerical code wherein symbols correspond to each number. There are 10 symbols each representing the numbers 0-9. The symbols are (sadly I don't know the actual name of some of the symbols so I'll just be as descriptive as possible):

Cross (Default) - 0
Hand - 1
Ace of Spades - 2
Eye...Thingy - 3
Heart - 4
Arrow Pointing Down - 5
Voodoo Doll - 6
8-Point Star - 7
Spiral - 8
Skull - 9

When the game is launched and the menu opens up, the first symbols displayed will always be 000 000. Keep in mind that if another code is entered without closing and relaunching the game, any previous codes or changes made will still be displayed upon reentering the cheat menu.
Clicking a symbol will increase the value by one. For example, clicking on the Cross (0) symbol 4 times will make it a Heart (4) symbol-which has changed the value from 0 to 4.

But now you must be wondering: "Oh wise and unbearably handsome Zombologist, where would some one like me find a voodoo code?".

Haha, oh you. You can find those codes on enemies in the form of loot. They will drop a scroll which, once picked up, can be viewed. So be sure to copy those numbers down and share them with anyone you're playing with.

The lesson concluded, lets get to the codes!

List of voodoo codes:
111 111 - Big Head Mode (currently not implimented in Alpha)
101 007 - Mask Unlock
123 321 - Mask Unlock
378 873 - Mask Unlock
420 420 - Mask Unlock
101 007 - Mask Unlock [New 0.3 Mask!]
224 226 - +100 Gold
717 717 - +100 Gold

Thanks for your contribution(s): keroksi, Harmony, Icospawn, Diseath