just choose somebody's flickr username whose photostream you want to include (e.g. Conor Lawless)

and/or somebody whose favourites you want to include (e.g. Conor Lawless)

and/or the group URL of a group you want to include (e.g. http://www.flickr.com/groups/starandshadow/)

and/or a list of tags you'd like to search for across flickr (e.g. Conor, Totally, Handsome, Yeah)

finally, pick a name for your gft