Well in this tutorial and the main focusing is one the ball and light. The rest can be design to be look more nicer amoung the ball. It is actually quite simple, the technique is to create the texture first and map it onto the 3D sphere. However, we will require Illustrator CS and above to create this awesome Illustrator effect.
1. Create the Disco Ball
Select the Rectangle Tool (M) and make a square object with light blue color. After this select the square object and hold Alt key then drag to make other object and give it as black color.