For the front end, I have seen ONE aftermarket bumper that makes the 06+ similar to older fronts ..... but only similar to older AFTERMARKET fronts. PTeazer makes a Bumperette Fascia that accepts one of thier full height front grilles. But it's $650 for the bumper, plus you need to buy one of the $1,000-$2,000 grilles to fit in the bumper.
This is what it looks like with thier cheaper grille insert:
Personally, I'm the opposite. I like the 06+ front end (especially with the lower stainless grille bars), but want to do a Retro Roll Pan in the rear.