In PRPC 7.1.8 binary file pxthrobber is final rule. It seems to me that this is not entirely correct.
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I checked this - and you are right - the Rule is marked as 'Final' - meaning that you cannot (easily) replace this icon with your own.
I have logged a Feedback Item ("Enhancement Request") for this:FDBK-11910 "webwb.pxthrobber.gif | Pega-UIDesign:07-10-17 is final" - this gives us the opportunity to review the feasibility of changing this rule to be 'non-final' in a future release of PRPC.