Every fall I make batches of walnut ink using black walnut hulls. It is a gorgeous medium for mark making and also for painting. Recently I was messing around with walnut ink on watercolour paper and my marks started turning into the branches of strange trees. Here are some of the results. (If you click on any picture, you will get a larger, more detailed image.)
These are for sale. Each one is 5 1/2″ x 6″ and is on 300 gsm watercolour paper. £45 GBP (or £80 for two) with free worldwide shipping. Please send me an email at email@example.com or DM at Instagram @book.and.paper.arts for more info.