ZkinandBonez said:

"The RGB colour scheme of the prequels"? The OT only had RGB, the PT added colours like yellow and purple into the mix. Of course Dark Forces II predates the PT, so technically they borrowed it from the EU.

I consider the RGB colour scheme a product of the PT because the OT never officially established red, green, and blue as being the only lightsaber colours anyone was allowed to use. Sure, those are the only lightsaber colours which make an appearance in the OT, but there are also only three lightsaber wielders in the entire trilogy, so there wasn't any opportunity to showcase a larger spectrum of colours in those films.

As for yellow and purple lightsabers appearing in the PT:

1. Only Windu -- out of all the Jedi/Sith in the movies -- has a purple lightsaber. He's basically the exception that proves the rule.

2. There are no yellow lightsabers in the PT. Yellow lightsabers made their first "canon" appearance in TCW.