Add WordPress Featured Images to both categories & tags, then display via a widget or shortcode on your WordPress site.
I think that the reviews for this plugin are a bit harsh. I'm not the biggest proponent of wordpress, but this plugin does exactly what it says - I can now add featured images to categories and use them in the exact same way as the rest of wordpress featured images. The reason for the 4 stars is because adding the featured image into the template has needed a bit of work. But in general, well done to the author.
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