They look cool, but man I hate the orange that bleach on black makes.

I had some where it was bleached up to straw-yellow. Looks gorgeous ... dies pretty quickly.

Sounds interesting - will look into ways of changing the color.

Basically, bleach longer or use a stronger bleach (which of course makes the shirt die quicker) or pick a black that is susceptible to your bleach (requires potentially pricey experimentation). It verges on alchemy :-)