Zentangles are really popular!  But where do you start?  I live in Australia and love walking through nature looking at the vegetation and color.  So I Googled forest floor images....and found a line drawing of some fungi.  I draw up some cards using the fungi grouping which seemed to give a nice "natural" feel.  Then I browsed clever artists' pages to find some zen patterns.  Here are 3 in the make... and one I just have to leave alone now... it is finished.