Not a perfect picture by any means, but a quick and dirty shot of how it turned out.
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(http://i.imgur.com/ws4zoYs.jpg)
Also, I totally messed up the space bar by getting the water too hot. I forgot that last time I did this, I just got the water hot, turned off the flame, let it cool a little, then dropped the caps in. You don't need boiling hot water to do it, just warm water. It works fantastically, but the smell is awful. Now I want to dye something crimson.
Also note, while I thought the different base color would make some darker than others, it doesn't. They turned out the same. And since it changes color so quickly, the only way I really see getting a lighter and darker color is by quickly dipping the caps in, then pulling them out within 30 seconds (though that might even be too long). You can dye a batch of caps in minutes with the dye. Only fabric really needs that longer time.
Very nice! This is basically my method as well. Did you have any problems with residue along the edges of your caps?
Definitely play with the cheap set first to get an idea.
Yes, I used Lilac. If you want some for cheaper than the Amazon price, let me know. A store near me sells them for $2.50 each.
This is how the Violet turned out for me on white and light blue caps. The purples will all turn out pretty close to each other. The lilac make end up a little lighter on white caps or may look the same as they came out with the beige and cream caps.
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(http://i.imgur.com/fna6J6y.jpg)