We shot a campaign here in Florida for Sunpass (prepaid toll) which required real people giving testimonials about how great using Sunpass was.
We ended up hiring a window tinter for the day, and had him apply different variations of tints on the cars depending on how bright the daylight was outside.
The final campaign was great, except for the car sickness after 12 hours inside moving cars squenched up in the back seat.
AC