Free-Power-Point-Templates.com and BrainyBetty.com offer free PowerPoint templates for educators. Brainy Betty offers video introductions, background music and flash animations for PowerPoint presentations in addition to background templates.
Free-Power-Point-Templates.com has over 60 educationally themed templates for teachers. Some of the templates are very plain featuring a bookmark or pencil, while others are targeted toward a particular discipline. For example, there are templates featuring calculators for math classes, atomic bonds for science and geometric equations for math classes. Several of the templates are themed with an old-fashioned chalk board.
BrainyBetty.com offers over a hundred backgrounds for PowerPoint presentations that are school appropriate. Some feature the seasons, others are targeted to disciplines such as science and technology and some are targeted to college professors. The site also offers free sound clips to include in PowerPoint files as well as video introductions and flash animations.