Star Wars Mace Windu Lightsaber
In 2002, Hasbro released a series of role-play toys including a Mace Windu lightsaber. This electronic lightsaber featured a purple blade and the design was based on the lightsaber as seen in The Phantom Menace. Mace would later changed to a completely different design.
Early concepts for this lightsaber were designed to utilize a color-changing blade feature. The user could select between 3 different color chips that would control the blade's color. The unused chips can be stored in end of the hilt. The blade itself was molded in a clear plastic with small grooves to help diffuse the light throughout the entire blade.
It is unknown if the color-changing feature was due to production costs or keeping it more screen accurate.