To theme specific Taxonomy Templates you can target the tag number and name the the template:
page--taxonomy--term--33.tpl.php
You can get the taxonomy number of the tag by using the Theme Developer module.
This template however will not work off the bat - it needs to have a page 'template suggestion' added to your template.php file as a preprocess function for Drupal to know about this type of template and to use it if it exists.
Pre-process functions already exist for some templates but not all - notably in Bartik there is page, node, block and maintenance.
Create a template.php file if one doesn't exist in your theme for example if you are running a sub-theme. You need to add the preprocess function for the taxonomy template - the template.php only requires an opening php tag - '<?php' also note to change YOURTHEMENAME
function YOURTHEMENAME_preprocess_taxonomy_term(&$variables) {
$variables['view_mode'] = $variables['elements']['#view_mode'];
$variables['term'] = $variables['elements']['#term'];
$term = $variables['term'];
$uri = entity_uri('taxonomy_term', $term);
$variables['term_url'] = url($uri['path'], $uri['options']);
$variables['term_name'] = check_plain($term---?>name);
$variables['page'] = $variables['view_mode'] == 'full' && taxonomy_term_is_page($term);
// Flatten the term object's member fields.
$variables = array_merge((array) $term, $variables);
// Helpful $content variable for templates.
$variables['content'] = array();
foreach (element_children($variables['elements']) as $key) {
$variables['content'][$key] = $variables['elements'][$key];
}
// field_attach_preprocess() overwrites the $[field_name] variables with the
// values of the field in the language that was selected for display, instead
// of the raw values in $term->[field_name], which contain all values in all
// languages.
field_attach_preprocess('taxonomy_term', $term, $variables['content'], $variables);
// Gather classes, and clean up name so there are no underscores.
$vocabulary_name_css = str_replace('_', '-', $term->vocabulary_machine_name);
$variables['classes_array'][] = 'vocabulary-' . $vocabulary_name_css;
$variables['theme_hook_suggestions'][] = 'taxonomy_term__' . $term->vocabulary_machine_name;
$variables['theme_hook_suggestions'][] = 'taxonomy_term__' . $term->tid;
}
Code from Drupal