I just ordered henna, indigo and amla, which should arrive in about a week. Will use it to cover my grays and also to try and achieve a deep red (like wine). I'm using the amla to further calm down some of the red and
to try and prevent my curl pattern from loosening.
If you're interested, I'll be posting comments about my results (possibly pics, too) in the 4a forum, under the thread I created called "Is Amla still Working for You?"