Well, this is highly subjective. The vast majority of people who opt to put emblems on their car resort to getting either the chrome or black 3.7 badges. Very few people try anything new or different. I think once or twice I saw a car with a "Powered by Ford" emblem but it's fairly cut and paste in the mustang community. It always has been.
Typically you'll see an AMR/RTR style wheel majority of the time being black with few variances, if they have a spoiler you have a very high chance of it being a GT500 spoiler followed closely by the pedistal style California Special spoiler. I can go on and on about what folks usually do with a Mustang per their generation. Look around, try to be different but prepare for heckling from those who feel you've deviated from the typical Mustang theme.