Listing All Thumbnails based on Custom Categories

I need to list(display) all thumbnails from my Custom Post Types in a page template based on product categories. For Example I have a Custom Category called “Art” and some images(Custom Post Type) products enabled by “Feature Image” associated with “Art” Category.Now I would like to list ONLY all thumbnails of Art category product on my Custom Page Template.

Can you please let me know how to do this? I find this method which works only for one page without ability to select from pages!
<?php the_post_thumbnail(); ?>