Agreed, I always loved how they used color. It was the fairly early days of color broadcasting and Trek was one of the shows that went out of its way to use the medium.
Then I remember one night visiting the appliance store with my family. They had a whole row of RCA color televisions, and "Star Trek" was on every one of them...in all it's primary color/pastel-soaked glory. As we walked out of the store my dad turned to my mom and said "We
have to get a color set". A week later we were watching "A Taste of Armageddon" in color!
NBC was at the forefront of color programming because its parent company, RCA, manufactured the most successful line of color sets...therefore the order came down that all NBC programming (including, of course, Star Trek) would make full use of this technology.