How can I create a legend (Key) like the one in the footer on WordPress StackExchange

This site simpley uses ■ and a span color for each link.

To query custom fields for your post type you should be using get_post_meta
http://codex.wordpress.org/Function_Reference/get_post_meta

To customize the query, check out http://codex.wordpress.org/Function_Reference/WP_Query , you can include or exclude practically anything you want.

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