app.js

    $http({
      method: 'GET',
      url: 'http://api.flickr.com/services/rest',
      params: {
        // Flickr API parameters
        method: 'flickr.interestingness.getList',
        api_key: apiKey,
        format: 'json',
        per_page: 3,
        nojsoncallback: 1
      }
    }).then(function(data) {
      $scope.photos = data.data.photos.photo;
    });

flickr.js

$scope.getPhotoUrl = function(photo) {
  return "http://farm"+photo.farm+
          ".static.flickr.com/"+
          photo.server+"/"+
          photo.id+"_"+photo.secret+".jpg";
}