Here's a nice trick: Kenan Profitt uses ambient occlusion nodes to accentuate edges on shapes. He uses this to create realistic rocks in Blender, but I can see how you can apply this to all kinds of objects.
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About the Author
Bart Veldhuizen
I have a LONG history with Blender - I wrote some of the earliest Blender tutorials, worked for Not a Number and helped run the crowdfunding campaign that open sourced Blender (the first one on the internet!). I founded BlenderNation in 2006 and have been editing it every single day since then ;-) I also run the Blender Artists forum and I'm Head of Community at Sketchfab.
