Part of livery ideas I have for the F3500-A is fictional open-wheel cars from other games/sims. For instance, the McPherson-Alpha Formula RR 90 from RaceRoom, despite never playing RaceRoom myself. (The McPherson was chosen in particular since I think the decals would be readily available, with it also on the V12 version of the car to match F3500-A's engine.)
I originally painted it carbon, but I in game carbon paint is a little too grey. Also, you can't apply the pearl look to decals. So, I inverted it. I painted the car Alfa Competition Red and added semi gloss decals. I chose no tire decals or tire branding on the car. You can always alter the tires in GT Auto.