Ugly Christmas Sweater

I want to make an Ugly Christmas sweater.
I've been to Ugly Christmas sweater parties and they are the coolest thing BECAUSE they are so ugly.

I found one at the Unique Thrift Store a couple of years ago but it's not ugly enough.  It has cute little cats in Santa hats.  

I've been to garage sales all summer and I am surprised that there weren't more Christmas decorations than what I saw.

I know it's only the end of August but one can never be too prepared.  I want to start getting the ball rolling now before I get too busy and then I won't have time.  So I want to pick your brains? Any ideas on how to go about making a Ugly Christmas Sweater?