dmikam

This simple plugin permits you to upload images to categories, tags and custom taxonomies just like to posts. 
This feature is very useful when you want to show unique image in header tor every category or even some slideshow of images. 
Also you can show a list of categories/subcategories with a little thumbnail am much more.
By the way, this plugin just uses wordpress native functionality – no aditional tables and nothing like that. 
Also it uses wordpress images so all sizes are generated automatically (custom sizes included).

WP Category Images

Simple plugin that permits to images to Categories, Tags and Custom Taxonomies.

PenciDesign

This plugin will create a new page navigation. Easy to use and custom it. 
With this plugin, you don’t worry about paging in your blog.
Multiple styles for navigation, you can see in <a href="https://wordpress.org/plugins/easy-wp-page-navigation/screenshots/" rel="ugc">Screenshots</a>
To using it in your blog, see the <a href="https://wordpress.org/plugins/easy-wp-page-navigation/installation/" rel="ugc">installation instructions</a>
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<h4>Support</h4>
Support is handled in the <a href="https://wordpress.org/support/plugin/easy-wp-page-navigation" rel="ugc">WordPress forums</a>. Please note that support is limited and does not cover any custom implementation of the plugin.

WP Category Images vs Easy WP Page Navigation