Blender shader help for a character

Hey everyone, I'm not a 100% sure this is the right location for this, if its not I'll move it asap!

I'm working on a simple fanart of Turing from Read Only Memories https://s3.amazonaws.com/ksr/assets/002/610/362/fc729988691b57a6a85221ec1190a2c7_large.png?1411155619

He's a lil robot that has a particular effect on his head that makes it feel like a marble or glass orb. I'm trying to figure out a super simple shader effect that's similar in blender.

Does anyone know how to make something like that or know of something similar? 

Thanks!

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