Can you remove the shadow box outline from group icons?

Since the background of my group icon is intentionally transparent, the goal of the icon is to fit into whatever the backdrop is behind it. This makes the shadow box look awkward, as it’s a square outline around a transparent icon, on a rectangle backdrop. Is there a way you could remove it, or make it only appear for non-transparent icons?

Here’s a pic incase I was unclear:
http://imgur.com/yYaUmAm

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