Flickrsets 2 WP is a plugin that allows you to get the list of Flickr sets for a given user.
Download, install, and activate the Flickrsets 2 WP plugin.
From your WordPress Dashboard, go to Settings > Flickrsets 2 WP Options > Enter your FlickR API Key and the default FlickR user ID to follow
In your template, call the global variable $f2WP and call the function $f2WP->flickrsets2wp_display_sets() to get the list of sets. Pass to this function any FlickR user id to override the default one sets in settings.
That's it ... Have fun