Awesome! I think is a good tweak! I like blue LED's, but I think that is because I had a blue LED deprived childhood. Everything was pretty much Green or Red LED's. I am guessing blue was too expensive/not vibrant and bright enough back in the day. 
I'm pretty sure that blue LEDs were developed a lot later than red and green. This is probably why you didn't see them as a kid. Nor did I. I am forty.
edit: Wiki is our friend (",)
"The first blue LEDs were made in 1971 by Jacques Pankove (inventor of the gallium nitride LED) at RCA Laboratories.[47] These devices had too little light output to be of much practical use. In the late 1980s, key breakthroughs in GaN epitaxial growth and p-type doping[48] ushered in the modern era of GaN-based optoelectronic devices. Building upon this foundation, in 1993 high brightness blue LEDs were demonstrated.[49
By the late 1990s, blue LEDs had become widely available]"
So, some time after the Megadrive at any rate!