Eco Dyeing and Printing

Being such a novice at surface design, my time with my fiber arts group is always enlightening.  Part of our discussion was about ecodyeing, or printing, or whatever one might call it.

In my definition (so far!) ‘eco dyes’ refer to the colours the plant can be induced to surrender, and ‘eco prints’ to the forms these dyes take on the substrate. 
https://wendyfe.wordpress.com/plants-for-eco-dyeing-and-eco-printing/

There is this whole new, fascinating world out there in using plants and their colors to treat fiber materials!  One book I may need to find:

   

So what does this all look like?  How could I NOT try this??