This is a fun experiment with the symmetry/radial adjustment of the brush tool in Photoshop. Make a new file that is 9 x 9 inches and 300 ppi. Click on the paint brush and go to the far right setting above the Photoshop work area (the symbol looks like a butterfly). There you need to select. "radial" and then pick 6, 7, or 8 segments. Now select the brush again and paint! Use a variety of colors and brush sizes (required). Have fun!
When you think the design is complete, save as a JPG. Do multiple designs and turn in your best one.