I was inspired by this pin I stumbled across one day. I had a large and small wine cork, the end of a pencil eraser, and some basic black and green paint. Nothing too fancy about it. It was rather meditative to stamp out all the dots to fill in space. I decided to add the two large spots of green to give a little more visual interest. I debated whether I should fill in the black dots completely, but I rather like the texture it has being imperfect.
Here it is hanging up in my den.
Updated to show the size relative to a standard box of tissues: