Vinyl, maybe, but you would have trouble with corners. Back in the day (mid 90's) we would use vinyl to add decals just before a car show i.e. rips or flames, some people would clear coat them on for an almost permanent effect.
I'm thinking like a hot pink vinyl on all the straight parts and purple duct tape on all the corners. There is a whole plethora of colors to choose from and its pretty durable.