private void loadIcons() {
		iconListModel.removeAllElements();
		List<ToolIconURL> urls = IconMap.getIcons();
		for (ToolIconURL url : urls) {
			iconListModel.addElement(url);
		}
	}
Get the icons from the icon map.
Ghidra/Framework/Project/src/main/java/ghidra/framework/plugintool/dialog/SaveToolConfigDialog.java