Here are a couple some of the things I think I could do in a reasonable amount of time with a minimal budget and very little destruction to my surroundings. I think I might actually use them, as well.
|1. Place a stencil over a coloured shirt.|
2. Spray with bleach.
|1. Make a collage.|
2. Stencil on top.
3. Paint white around the stencil.
We'll see. Thinking about it is easy. Doing it is a whole other department of effort, and I'm not sure if it's open for business yet. :)