images - WP Developing

Can one create categories that use images instead of text for their display?

Yes, by adding a custom field to the taxonomy with the type image. Locations by default include this image field, other taxonomies do not.

The plugin currently uses 240×180:

add_image_size('drts_thumbnail', 240, 180, true);

This can be overridden by adding code to the functions.php file of your theme:

add_action('init', function() {
    add_image_size('drts_thumbnail', 240, 160);
});