Choose the time, date and location. You can also change the background color and objects that are displayed. The program can be added to the Startup folder so it opens every time you start your Mac. When you click the program icon to start it, a little screen pops up with the program name. It also says "Click here for preferences." Click on that to set the options you want, including the background color.
For more information, including on later updates, please read the documentation or visit the home page.
Requirements are: a Power Mac and Mac OS 8.5 or higher.