Concave diffuser for a ringflash!!!

My friend Hisham came out with this most creative way of using a ringflash.
Better light and no more weird (or cool) catch lights in jumping spider's eyes.

His macro rigs consists of Pentax K5, SMC Pentax D FA Macro 100mm F2.8 WR3, Pentax AF160C Macro Ring Flash. However, instead of using the ring flash the way it is intended to be, i.e mounted onto the front of the lens, this is what he does. The images here should be self explanatory!  
Sample images:

More details here .

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Macro Photography Blog: http://orionmystery.blogspot.com