Today I experimented with a bleach stencil of the demon wallpaper design on a cheap T-shirt. I cut the template out of heavy weight paper and attached it to the shirt with spray mount. I cover exposed areas of the shirt with paper then sprayed bleach over the stencil with a spray bottle in a WELL VENTILATED area. The paper stencil was a one time use, so I ripped it off and hit the shirt with a few more random sprays and spatters, then rinsed and washed.
I used my demon wallpaper template which can be found at http://www.haunteddimensions.raykeim.com/index250.html
You may want to add connecting strips to some of the areas of the stencil so it doesn't fall into too many pieces.