I've installed strobe lights on a car before. They don't really blink together, I mean if you install two of them then they will both blink but they probably won't be synchronized. To answer your other question, yes you can get them in different colors. And if your boy had red in his headlights he might have just changed the normal park light bulb to a red one. Or they do make these neon lights that can go in your headlight housing. You can buy all this stuff at
www.streetglow.com