TCL Categories Images Plugin allow users to add an image to category or custom taxonomies.You can easily assign an image to each category/taxonomy or tag and then display image for category/taxonomy/archive template via following functions.

Usage:

<?php if (function_exists('tclTaxonomyImage')) tclTaxonomyImage(); ?> to display image
<?php if (function_exists('tclTaxonomyThumbUrl')) echo tclTaxonomyThumbUrl(); ?> to get URL

Here, You can specify image size as a second parameter

<?php if (function_exists('tclTaxonomyImage')) tclTaxonomyImage(NULL,'thumbnail'); ?> to display image
<?php if (function_exists('tclTaxonomyThumbUrl')) echo tclTaxonomyThumbUrl(NULL,'thumbnail'); ?> to get URL