For a clean, modern look, try a star or mandala design built from simple shapes. Draw a large circle with chalk, mark the centre and divide it into eight equal sections using straight lines. Add a smaller circle inside, then draw triangles in each section to form a star. Fill the triangles in alternating colours, such as red, yellow, green and blue, and finish with a border of small dots. Using a ruler, a plate or a bowl helps keep the shapes even.