i can see using vinyl backgrounds for your stock bodywork (maybe) , and if you are using the same bike with different riders needing the same bike..to switch back and forth.. but painted backgrounds are the way to go with race bodywork i would think. Perhaps the vinyl gets ya by on the weekends before you paint the bodywork? I mean if your painter is gonna do the bw, he can easily do the yellow or white background when he shoots.
will always look nicer than wavy bubbly vinyl . Totally agree that the vinyl gets ya by in a pinch though.
just go to your trackside vendor and get a roll of racer tape in the color ya need. Will cost like $7 and you will have a bunch of ducttape left over. (racer tape isn't as nasty sticky as actual AC duct tape). There is nothing that can't be fixed with zip ties and duct tape!
Racertape backgrounds would be a step lower in the "bling" department from vinyl, just throwing out options..