Some people use the tag cloud widget in WordPress to show their post tags on a widgetized sidebar but you can also manually add a tag cloud to your theme – which is perfect for creating a custom tag cloud page template or for adding them to your theme in areas that you don’t necessarily want widgetized. This WordPress code snippet will display a custom tag cloud anywhere on your site via your theme files.
Add this code to your template files where you want the tag cloud to be displayed..
'smallest' => 10, // size of least used tag
'largest' => 18, // size of most used tag
'unit' => 'px', // unit for sizing
'orderby' => 'name', // alphabetical
'order' => 'ASC', // starting at A
'exclude' => 6 // ID of tag to exclude from list