A while ago I did some work on a friend's bike. She had white bar tape and a white saddle. I was oh so careful to avoid the white tape, finished the work, took the bike off the stand and put a big mucky print on the bar tape in so doing. So I cleaned it off, but now I had a pristine white patch and the rest of the tape was grubby grey. So I cleaned the whole side. Then I had to do the other side to match. And of course the saddle too. So my friend got a free bike valet thrown in with the free mechanical work.
I have red/black camo tape on my bike. Doesn't show the dirt. Also doesn't show the bits of black electrical tape that are there to repair patches of damage.