A potpourri of works inspired by parasitic plant materials:
Of course there is one very common artwork made from oak galls, Ink! Oak gall ink (also called Iron Gall Ink) has been used for centuries as a vital component to create indelible and intensely dark ink. Though commonly associated with medieval monks writing on vellum, many modern artists use it today. Susan Deakin envisioned the interior of a 147 year old oak tree by painting out tree rings using wasp gall ink:
There are countless recipes for making gall ink out there. Next year I hope to team up with a friend of mine who is an ink expert, and make some ourselves!