James Madison University created a template for making a Jeopardy style review game using PowerPoint that can be used for free Click on the Jeopardy name and save to disk to modify and insert questions.
http://www.jmu.edu/madison/teacher/jeopardy/jeopardy.htm Game Show templates
This PowerPoint template site has directions and templates for making Jeopardy, Who Wants to be a Millionaire and Hollywood Squares game. There are also some examples of the different games.
http://teach.fcps.net/trt10/PowerPoint.htm Game Show Templates
There are several review games on this site for PowerPoint. There is a Jeopardy, Who Want's to be a Millionaire, a variation of Hollywood Squares, Weakest Link and Guess the Word.
http://jc-schools.net/tutorials/PPT-games Designs and Themes for PowerPoint
This student and educator page is loaded with designs and themes for PowerPoint.
http://www.websiteestates.com/education/templatesindex.html 36 Themes for PowerPoint
This is a free downloadable zip file with 36 different themes for PowerPoint. You will need a program like winzip to open this file.