A few years ago I had a painting assignment. I was told to find an organic item to use as a stamp. The stamp was to be brought into class with a finished art product. The art product had to incorporate a stamping or stampings of our organic item. We were to present the finished product to the class for a critique. The class was supposed to guess the organic object used. --- Stan Murmur
I didn't want to spoil the surprise (which this link will do), but if you're not familiar with this, it's fun to guess at it before looking at the answer. I discovered this art several years ago, and apparently the artist has been in the news lately. Here's his website with all sorts of coverage of his painting methods. Be sure and click on the gallery for some very interesting pieces created with a bare minimum of... er... brushes.