I think you are asking how they perform the faux-3d effect on the billiard balls, and is it "real" 3d models or not. I'm not entirely sure what technique they used, but I don't think that its "real" 3d.
I would guess that its a distortion of a stereographic projection of a billiard ball. There is an example here that talks about the distortion technique in flash, but still uses an underlying 3D model to "drape" the texture onto. And another example here that talks about using another pixel bender to create the faux 3d sphere effect, similar to something like this.
Now, Adobe Pixel Benders are functionally equivalent to pixel or fragment shaders. So you should be able to use the references here to do something similar to a sprite in XNA.