HOWTO Bleach-stencil a shirt

This tutorial sets out the multi-step process by which you can stencil your clothes with bleach, working in inverse to create ever-lighter fabric sections by spraying on diluted bleach. Link (via IZ Reloaded)

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http://www.dharmatrading.com/html/eng/1574-AA.shtml
This product lets you paint the bleach on directly. Pretty neat.
I love making shirts this way:
http://www.flickr.com/photos/tommybear/sets/72057594114214999/
Although I haven't tried doing multiple shades.