I think an open speed challenge with Advanced Editing rules is apropos given the challenge title (and what that phrase means in today's society)... just the admins having some fun. =]
A duo-tone requires two people and a microphone. ;-)
...or you could do it the boring way and convert your image to grayscale in Photoshop, then convert to duotone, pick two colors and play with the curves for each. On a Mac, you can just use the Help menu for details (probably a similar feature in Windoze).
