To show icons next to menu entries, it will be necessary to
ensure they are enabled in the <menu> section of the ~/.config/openbox/rc.xml file:
<showIcons>yes</showIcons>
Where using a static menu, it will then be necessary
to edit the ~/.config/openbox/menu.xml file to provide both the icon = command, along with the full path and icon name for each entry. An example of the syntax
used to provide an icon for a category is:
<menu id="apps-menu" label="[label name]" icon="[pathway to icon]/[icon name]">