On researching I came across some great websites that I thought I'd share with you. They are full of ideas and as I try any I will let you know how they go. The first is from Wellness Mama (whom I believe is linked with the reputable Vintage Remedies - professional herbalists - they know their stuff.
Here are some other links that I found while searching on google for non chemical ways to dye your tresses: (some may just be for dark as that's what I was initially searching for)
This video is a review on Aveda salons and how safe they it. It shows that though Aveda salons are not yet 100% non toxic/safe they are getting very close and striving to be non toxic and safe in their treatments. So they are a much better option than a normal salon with regards to exposure to chemicals. I thought that's worth keeping up my sleeve too in case I can't get the results I love and am so used to through my own efforts...maybe they can?
For those of you that aren't aware of what coloring your hair with chemicals does to you - here are a couple of links just as a start but in no means comprehensive, that will get you started.
This blog is in no means comprehensive as I've just started my research on this so please feel free to comment below if you've found anything safe that works! I'd love to know and I'm sure others would too.