Edit 2013- A lot of people still ask me how I did the cosplay, so I'll include a short explanation here:
-For the head, I used paper and paste (it's called pulp right?), and I glued the paper on a balloon that was the size of the head. I made that layer pretty thick, and after that covered the head with some modeling clay that dries on itself to smooth the rough parts. After that I painted it with acrylics.
-For the fingers, I made a glove with three fingers and put iron wires inside.
-The puppets are simply made from urethane and cardboard.
Also I'm using a self-made vest underneath the shirt, which creates the Salad Fingers-like body structure, mainly the hump and the flat stomach.
Heheheh, an overall good cosplay. If I saw you just walking along the streets with that costume one day, I'd automatically give you a hug!
And the hands, I sewed Salad Fingers-typed gloves and then just stuffed them with cotton and I put iron wires in them so I could move the fingers a little, it's very easy