You can use 3 programs.
One, Dolffin Live, you can find it here.
http://www.nba2kstuff.org/flipper/
Two, EA Graphics editor, you can find it in the downloads section.
Three, bigGUI, you also can find that in the download section.
I recommend using Dolffin Live cause it's the easiest.
Okay, open one of the programs, and open C:/Program file/EA Sports/NBA Live 08/fe
Then open the file called
arenas.
Then pick the dorna you want to edit, and extract the FSH file you got the dorna from.
EDIT: Sorry, I mean the
BIG file you got it from.
YOu need FshX, which is in the General Downloads Section.
Open the FSH file with FshX, and extract the texture.
Edit with anything, and save.
Then open the FSH file again, and import your texture.
Then place the FSH file in your NBA Live 08 sgsm folder, which you can find in,
C:/Program files/EA Sports/NBA Live 08/sgsm
It should load your dorna.
Good luck,
-JR