This may be a bit weird but you may have a rather rare opportunity at your doorstep. Some people have taken shots of how low Lake Lavon is and that there are sections that have a number of dead tree trunks with limbs that are fairly concentrated with a dry lakebed that had pretty much been dry for a while. You may want to test out the land to see if it would support a car carefully driven out there and get a rather etherial photo with the dead trees the car and the model.
http://www.texasphotoforum.com/forum...ad.php?t=30401
Car shots are so subjective concerning the background, are you looking for a striking scenic shot? a certain style of building? a skyline? etc
So more info would really be needed to try to direct you to a location around the area.