We [http://www.madebysofa.com http://www.madebysofa.com] make some icons too and use a mix of Cinema and Photoshop. We mostly sketch in 3D to get the lighting r

We [http://www.madebysofa.com http://www.madebysofa.com] make some icons too and use a mix of Cinema and Photoshop. We mostly sketch in 3D to get the lighting right, and then redo the entire icon in Photoshop ending up with a bunch of shape layers with lots of layer styles.