I found this fin a couple years ago while I was camping at Trails in San-O State Park. It was shoved between a few rocks that had washed up on shore and covered with tar. I took it home, rubbed it down with some baby oil, sanded it a bit, and here it is today.
The stand is a scrap piece of curly redwood from the dumpster of a local surf shop and the dried seaweed that is glued into the redwood is also from Trails at San-O.
4"x9", acrylic on fiberglass