In the main menu, go to "Features" and then "Codes" and input these to get two new uniforms and a new ball to play with. To use the ball you must turn the feature on afterwards by highlighting it in the "Cheats" menu and pushing right on the D-Pad. The All-Star Ball can not be used at the same time as the ABA ball.

Password - Effect

ply8mia - 2007 All-Star Ball
syt6cii - 2007 All-Star Uniforms
vdr5lya - New Orleans Hornets Uniforms (Valentine's Day)