The package contains both a component and a module. Use the component to add/delete/publish, etc new icons (provide a link and an image). A sample icons is included to show you what values are needed.
The module must be published in the 'icon' position for the administrator. You can copy the module to make additional icon groupings. The module can also be configured to display icons from all categories or from specific categories.
The project is hosted on GitHub, so fork it and send me a pull request or let me know about desired features!
I've lost the Joomla and Extensions Update Check Icons but I don't use them.
Lacks the ability to reorder the icons and I have an issue deleting items (posted on github).
Thanks for the kind words. I like when others can use one of my extensions. Let me know on GitHub if you have any ideas for improvement.