Because most C4 ZR-1's are modded in some ways, it might be cool to have a companion poster, (in similar graphic style), called "This ZR-1". with blanks to be filled out by the current owner describing the things that are unique to that particular car:
With blanks for,
Color- One of five "dark purple" 1995 ZR-1's".
Mods.- "Top end of engine blueprinted and upgraded by Marc Haibeck to 510hp. spec."
List of bolt-ons- Fidanza light weight flywheel, 4.10 gears, Watson headers, etc.
Performance- "This car competed in the "Texas Mile 2009" running at a speed of ***. And has a best quarter mile time of 11.**@12*mph.
All of this info could be filled out by the owner, by hand, or re-printed with the info in the blank spaces.
Just a random thought.