I've just started playing with natural dyes, first picking them out of my back yard and then, when I got tired of turning things yellow, buying them. So far I've used madder (my method was problematic, but I just wanted yarn that wasn't YELLOW) and indigo, and I am sort of in love with the magic of indigo (I used the Jacquard pre-reduced indigo kit).
Pics of dandelion dye, one of three skeins of various yellow (don't even talk to me about red cabbage, I discovered I just can't stand the smell long enough to dye things with it), a couple of madder dyed yarn, and mostly indigo! are over here
at my flickr account.
This weekend I'm planning to do either alkanet (if I remember to pick up isopropyl alcohol) or cochineal, more updates as events warrant. ;)