Things that can be done graphically(within the existing frames and some connected to suggestions):
*Images in the drop-down menus
A lot of them are only the standard basketball and don't have a suitable motive.
*Player faces
Some more to keep the the diversity of players and personalities unique. This could include apparel such as headbands, goggles and so on..
*Sets for customizable Jersey option (If there ever will be such an option)
This needs cooperation between programmer and graphic designer
*The trading card idea needs a graphic designer. Could be incorporated in the same graphic layout option where your team jerseys would be (if it ever would be).
*Advertisements
Always needed. Let's not just pull an Evony. Fooling people that are looking for halfnaked babes into the game is just lame. Although a cheerleaders inbetween game periods are a nice suggestion. But that's dance and has nothing to do with flowers and bees...
I am sure there are more, but these was the first to pop into my head. Feel free to add more.