Icon Effect

Hello, I would like to do the effect of the IDROID logo (http://iirojappinen.deviantart.com/art/iDroid-icons-for-Android-146955378 OR http://lab.iirojappinen.com/idroid/) but I have no idea where to start.

Could you please recommend me a tutorial for Photoshop / Illustrator or some hints on what to google?