It's easy, just be damn good on both ends of the floor. While many will discuss how unselfish the Spurs are. How they pass the ball relentlessly give up the good shot to get the great shot, their offense really comes down to one thing.
Everyone on the floor is a multiple threat player. Everyone gives you either defense and one offensive skill or multiple offensive skills.
They always have at least two very good three point shooters on the floor, frequently three.
They always have at least two guys who can score in the post.
They always have at least two guys who can put the ball on the floor.
Oh yeah, and everyone can pass.
The Bulls actually mimic the Spurs offense. They pass the ball relentlessly looking for the great shot. The problem is they don't have the shooters, ball handlers, or post presence guys to finish. When the Bulls make the extra pass it doesn't land in the hands of someone who can beat you in multiple ways.
It frequently lands in the hand of someone who can't beat you at all unless he's got no one to beat because the passing led to a wide open opportunity.
It means a good defense can beat the Bulls by forcing pedestrian shooters to shoot threes or close out on shooters and force them to drive. It's easy to take the Bulls out of their comfort zone, because there aren't multiple threat players, and Chicago certainly can't hurt you from all over the floor like San Antonio.
"Spurs basketball" isn't just about passing more or playing the right way. It's about having tons of versatile offensive talent on the floor too. Something Tom Thibodeau, Gar Forman, and John Paxson all need to remember.
The Bulls haven't done the best job of getting offensive talent, but Tom Thibodeau has also refused to play the offensive talent as much as he could. Why did Kyle Korver's minutes rise by 10 per game in Atlanta while Keith Bogans was still logging 15 minutes per game in Chicago? Why was Jimmer Fredette completely nailed to the bench?
Both the front office and head coach need to make some adjustments to get over the hump on the offensive side of the ball. Getting some star offensive talent would be big. Getting a healthy Derrick Rose would be huge, but beginning to consider playing role players who can create/shoot even if they aren't candidates for an all defensive team is mandatory as well.