Cutting plywood or plastic — NV always bargain waste. See peat do you have idle remnants of any previous cutting? If there is trim in the form of a quarter circle and two triangles, it is almost ready corner shelf for indoor or balcony plants. The triangles, connected by slots to form the bracket, and the third part nailed it with small nails, shelf. If the workpiece is wood, you need to coat them with oil paints a bright or, on the contrary, neutral colours.