Per request, but not really a program icon, I created a tangofied version of the “Close” button for The P4A (php for applications) php frame work:
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Blog by Jakub Szypulka 
great to see this new and brilliant icon, the official tango theme should include your artwork to make the inclusion easier.
by the way i’m reading articles telling that GPL software can’t bundle CC artwork…
Thank you, Fabrizio! By the way, I can change the license of this icon!