I want to make a semi-3D racing game, but I need graphics. Does anyone know where I can get good quility graphics of cars and buildings?

I need the following views:
- Cars: Top, Side, Front, and Back.
- Buildings: parall and perpenditular

Also, how easy would it be to take those four views and create a view rotated inbetween them, such as 25 degress X, 10 degress Y, OR 45 X and Y.

I would prefer the pictures be in jpeg or bitmap format, although gif would work too. The background should be one color.