imagemenu, creates an image menu with the pages specified in the shortcode or template_tag
And of course, if you find this plugin useful (especially if it gets you out of a fix in a commercial setting), please feel free to leave feedback via the donate button on the plugin homepage. (I am grateful for those people who have already bought me a beer 🙂 )

ImageMenu

Create a menu using the featured image of a page.

Milan Dinić

<a href="http://blog.milandinic.com/wordpress/plugins/nav-menu-images/" rel="nofollow ugc">Plugin homepage</a> | <a href="http://blog.milandinic.com/" rel="nofollow ugc">Plugin author</a> | <a href="http://blog.milandinic.com/donate/" rel="nofollow ugc">Donate</a>
This plugin enables you to upload images for nav menu items on a menu edit screen. By default, those images will be displayed instead of text for respective menu items. Note that after upload, you should set an image as ‘featured’ to be able to display it.
You can also set images that will be displayed only when you hover menu item, or when menu item is of currently displayed page. <a href="http://blog.milandinic.com/wordpress/plugins/nav-menu-images/#how-to-use" rel="nofollow ugc">Read detailed instructions about using plugin</a>.
Developers can use many available filters to make their own way of displaying images, or even create a child class on top of base one. See source code for more ideas.
Although this plugin displays uploaded images out of the box, it will probably not give best possible look, so it’s recommended to create custom CSS styles for affected elements.
Nav Menu Images code is partly based on a code from now defunct plugin Custom Menu Images by <a href="http://huellaspyp.com/" rel="nofollow ugc">Anabelle Handdoek 
</a>/<a href="http://8manos.com/" rel="nofollow ugc">∞manos s.a.s</a> and a code from plugin <a href="https://wordpress.org/extend/plugins/metronet-profile-picture/" rel="ugc">Metronet Profile Picture</a> by <a href="http://www.ronalfy.com/" rel="nofollow ugc">Ronald Huereca</a>/<a href="http://www.metronet.no/" rel="nofollow ugc">Metronet Norge AS</a>.

Nav Menu Images

Great and light weight plugin, without affecting core functionality of WordPress.



Code quality

Does what it's supposed to.
Would love the possibility to choose wether or not to replace all link content - would be nice if the link text would still be shown + adding a custom class to image.

ImageMenu vs Nav Menu Images