Here are the stickers I currently have on my 4Runner. Some of them I made myself from printable, self-adhesive vinyl and mounted on rubberized magnetic sheet, so they can be repositioned or removed:
Had to wait until I installed the Gobi rack and ladder before I could put this last one on. My "Rocket Aerial Photos" sign is made of red, reflective vinyl, with a black outline. It really lights up at night:
Unfortunately the ladder blocks my T4R.ORG sticker, so I'll probably have to scrape it off and replace it.