Unfortunately, we do not provide white labeling of the icon. Apart from purely marketing reasons, there is another reason - the program should be clearly identifiable by the user (and security staff/admins if any) as being Remote Utilities.
However, you can still customize the Agent window itself, as described in this tutorial.
Thanks anyways, I imagined this might not be possible at the moment. I assumed that using the main, most recognisable blue icon would rather be beneficial in terms of marketing and identification reasons. That is, however, mostly a matter of personal preference to me. It seemed aesthetically coherent but to be honest, I just like the blue accents. The current Agent theme isn't bad at all, you might still consider the idea though.