Consider what your goal is in creating this piece of art. If you want to be seen from a distance, use bold shapes, bright colors, and wild imagery. Fluorescent colors attract quite a bit of attention. If you want people to discover your car, keep the design subtle. When deciding how you will transform your car, consider its shape, style, and detailing.
Some cars make great flat canvases.
Others just ask to be sculpted. An artist who recognizes and works with the original shapes and lines of the cars yields an even more beautiful creation. Consider using exaggerated scaled, repetition, and dramatic color to highlight your design. Costuming for the driver and passengers can be an effective part of your presentation. Consider using props, sound, light, and maybe even smell as your design your car's personality.