Shodor Education Foundation
Shodor Interactivate: Circle Graph
This site shows how to set up your own pie chart for papers and projects. Very colorful and it is free.
Colorado State University
Colorado State Writing Center: Charts
The use of charts and graphs can improve your presentations, whether on paper or as visual aids. Here you can read about how to create line, column, bar, pie graphs, and scatterplots. Just follow the links to their respective pages.