My laptop is always set up like that with everything as large black text on white so people can easily see output from the back of the room.
It's pretty easy to do... when you're in a console window, click the Title Bar icon in the upper-left and choose Properties, and then go to the Colors tab. From there you can mess with the foreground and background colors.
The other trick I use when showing people console output is to hit Ctrl-F5 instead of F5 to run without debugging. This automatically ends the program with the "Press any key to continue . . ." without having to put Console.ReadLine() in at the end