The Categories Images Plugin allow you to add image with category or taxonomy.
Category and Taxonomy Image Plugin allow you to add image with category/taxonomy.
HMK Featured Images enables the user to set different featured image for each category, sub category or page.
Have featured and cover images for tags, categories and custom taxonomies
Manage thumbnails for categories, tags or any other taxonomy's terms of your WordPress website.
The WP Multiple Taxonomy Images Plugin allows you to add multiple images to a term. It supports category, tags and custom taxonomies.