This bleach staining process has been around for a number of years but has remained relatively unknown. The potential complexity and variety of images that can be made is virtually unlimited. More examples of what can be achieved and alternative staining methods can be found here: http://www.reddit.com/r/bleachshirts/
Things you'll need:
Here are links to the first two designs used in the video:
If you can't buy freezer paper in your country you can make your own using this guide: http://imgur.com/a/InhvE
Be sure to let me know if you give this project a try!