Sorry about the blurry pictures, I did this at night.
P.S. this is my first instructable, so bear with me.
P.P.S. This modification was based on the one available at: http://shop.lomography.com/holga-backup/35.html
Step 1: What you'll need
A Holga camera
Long, thin rubber bands (2x)
Cardboard (or any kind of padding material)