I've just uploaded a font called Pie Charts for Maps that you can install in
Windows. Then in PowerPoint you can type to get a wide variety of pie charts to
represent the balls you want. (Whatever I write just comes out wrong. <G>)
Try typing aflpu and go to Format > Font and select Pie Charts for Maps and give
it a size of about 36 for good visibility.
See
http://www.soniacoleman.com/FAQs/FAQ00197.htm
Be sure to read the license agreement that is included with the font. It's very
liberal if you just want the font for personal use. However, if you distribute
it, as I am doing, be sure that you are in compliance.