It’s hard to argue that the advent of color computer monitors hasn’t been a huge net benefit to society, but one might also say that that the world of monochrome had a certain charm to it. Perhaps there was even an event where you didn’t quite plug in the monitor correctly and were treated to and/or tortured with a whole new non-color scheme before making the appropriate adjustments. If you’re nostalgic enough for those days, then spark2k06 has a solution in the form of the MonochromeVGA.
The device takes in RGB signals from a VGA source (e.g. a computer), and transforms them into either a black and white output, or a selection of red, green, and blue, selected with a set of DIP switches. These allow for different single-color outputs, such as green and amber, allowing you to hit a retro nerve for nearly any system! You can also set the device up to display in normal color mode as needed without disconnecting anything.
Check how the adapter works in the first video below, with a clip of the optional 3D-printed case being assembled in the second. Take note:: the sound at approximately 25 seconds in, has quite the pleasant snap-together action: