The only non-custom options are the 4.6 HiPo badge, different era GT/pony emblems (some find the v6 emblems more attractive), or Powered by Ford badges. You could always go with cobra badges and look like a toolbag, too.
Autobadges can custom make anything you can imagine. They have lots of photos to give you ideas as well.
I've also seen Pontiac Grand Am GT badges on a New Edge. It was wicked looking because they're flat black and in italics.
Aside from that, there really aren't that many options without trashing up the car. As for what it looks like, just go hit up AM and look at the photos for each emblem.
The last option I can think if is stripping them all off and going clean.
Here's an example of the grand am badge.