\NBA LIVE 08\fe\arenas.viv is where they are located. Open the .viv file with BigGUI, export the team that you want to edit, and open that file with BigGUI as well. Then export the .fsh file that inside, and open that with FshX. Export the image, make the changes, and import it back. Then import the .fsh file back, and rebuild the .viv. Then place that file in the \NBA LIVE 08\sgsm\ folder.
Might be a bit much to take in at once. Let us know if you get stuck anywhere
