Press g+g on your keyboard and select priorities. Click edit at the priority you'd like to give a new icon. Click select after the Icon URL:
Screen Shot 2016-12-26 at 16.27.06.png
If you have access to the images url (<your JIRA>/images/icons/priorities/) you could add your icons there. If you don't, you could refer to an http:// url as you can see from the description with the image path if you can.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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