I had a lot of fun playing around and creating things with the one line concept.  The birdfoot violets, the rose and the pilea plant were all done on the iPad.   The swallowtail and ironweed were done with pen and paper.  For the violets, rose and swallowtail I used personal photos for reference. The Pilea plant is my office plant and I drew it from the actual plant.  I also uploaded a photo of the butterfly one line drawing to procreate and reversed the colors making it white on black and I thought that looked cool.