Wow Ed, that is hands down, the coolest Rambler I've ever seen!
It's called GIMP. GNU Image Manipulation Program. You can download it free from these links:
For PCs running Windows- GIMP - for Windows
For Mac running OS X- GIMP - Downloads
It's really easy to colorize and adjust images , once you learn the process. Being in white primer, your Rambler is the perfect blank canvas.
I've been experimenting with stripes of my own design and graphics (swiped from CutRiteFX.com - Custom Vinyl Graphics & Decals, Stripes, Window Decals, Cars, Trucks) on my Velo Rossa project. It's mostly to keep me in the project while I'm waiting for parts. But it has opened my eyes to possibilities other than a solid color.
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Like HOTRODPAINT says, every color and design gives the car a unique feel. I wouldn't have a sense for that without my little computer testing process.
Of course, the downside to that is, I now have even more choices to consider AND more expensive choices at that...:o