A simple swirl and a shallow dome shape can produce roses! Isn't it just wonderful? :)
Those shapes are not made from rubber/eraser. I did not use my carving knife and erasers this time. I used scissors and foam instead. U can buy those foams at the stationery sections. As for the wood mounting, any block of hard material with a flat surface will do. Or you can buy a whiteboard duster with wooden handle and chuck away the duster.