code: function createPictures(id, farm, server, secret) {
  
  		var NO_LIMIT = 2048;
  		var sizes = [
  			{id: 't', max: 100},
  			{id: 'm', max: 240},
  			{id: 'n', max: 320},
  			{id: '', max: 500},
  			{id: 'z', max: 640},
  			{id: 'c', max: 800},
  			{id: 'b', max: 1024},
  			{id: 'h', max: 1600},
  			{id: 'k', max: 2048},
  			{id: 'o', max: NO_LIMIT}
  		];
  
  		return sizes.map(function(size) {
  			return {
  				source: createPhotoUrl(id, farm, server, secret, size.id),
  
  				// Note: this is a guess that's almost certain to be wrong (unless square source)
  				width: size.max,
  				height: size.max
  			};
  		});
  	}
docs: See: https://www.flickr.com/services/api/misc.urls.html