http://psd.tutsplus.com/tutorials/photo-effects-tutorials/soil-cake-pie-charts-and-infographics/

Infographics are an efficient and fun way to present data. You may notice, however, that infographics are often flat vector illustrations. What if you wanted to create something a bit more photo realistic? In this tutorial, we will show you how to create a soil cake using photographic elements for use in pie charts. Let’s get started!