You may have to do it the old fashioned way and mask. I doubt there is a decal set made to cover an entire car. It would not be fun to try to set that decal anyways.
You can do it. Use some pictures for reference and mask out the design. Give it a nice gloss coat. I'm sure your friend would cherish it even more if it was a custom paint job.
Play that R. Kelley song "I believe I can fly" in the background and do your best work. Oh, and take pictures.......