Some time ago, the creator of retrohax.net embarked on a vacuum-forming project. The main goal of this project is to vacuum-wrap keyboard keycaps with vinyl foil for protection and coloring. This method is superior to painting with semi-transparent paint. Vinyl wrapping offers greater durability, maintaining its color even after extensive use, unlike painted keycaps, which can fade with heavy typing.
To learn more about the project and see the results click here.