You can change textures and stuff, so colours and shades of things look different, but there isnt a way i know of to change the actual shapes of anything. You can make your own using photoshop or similar graphic editing programs. You can also download pre-made textures from the LFS Database. For examples of different textures, check out this link... http://www.lfs-database.com/index.php?categoryid=2
Just click the section you want, in this case, Texture base > Cars > Interior/Extrior. Choose the car you want, which i guess will be XFG or XRG, and browse or download.
Please make sure to back up your original files, just in case!
