If a livery editor were to be patched in, who would sponsor your favorite car?
I dunno. In Forza I just slapped a bunch of pre-made sponsors all over my car, like Bridgestone (because they made an outstanding tire for F1), but eventually I started just having my own livery with myself as my own sponsor. Once in a while I'd get bored and just slap a bunch of images that other users made onto a handful of cars; namely stuff from Grand Theft Auto like Cluckin' Bell, Burger Shot, and Sprunk.
Here's an earlier FM3 livery with sponsors like Bridgestone and Pennzoil, as well as my own F1 logo and Mountain Dew logo, and a Vodafone logo that I believe another user had created (they're the title sponsor of my favorite F1 team):
Eventually I ditched the brand sponsorship and this one has my own "IceMan" ambigram that I whipped up:
Here I just got lazy and slapped those GTA sponsors on there:
And here I whipped up a NASCAR livery with a bunch of stereotypical sorts of sponsors, for giggles:
This one is slightly more basic than what I usually run, but I was again feeling a bit lazy, but by this point I changed my number from 07 to 68, which is the number I've later used in GT5:
(I upgraded the crap out of that RX-7 to get up over 263 MPH at La Sarthe here.)