I did a quick solar/stovetop dyepot today with the shrimp plant (thanks for the identification, Huette!). I pulled a bunch of the leaf/flower combinations, and put them in the pot on the stove with water. When it was almost boiling, I put it out on the back porch in full sun, and added some silk that had been mordanted. I can't remember if that silk had been soaked in anything else - it didn't look colored, at any rate.
The results are here:
http://www.facebook.com/photo.php?pid=30367263&l=d25fe5487b&id=1483107800 I have some wool soaking in it as well, but it's not nearly as good a color yet.