'Search for anything' they say...
Why not try your surname? Or a place name. Search is an 'index' and returns photos tagged with the search term.
How about 'shop'. Too many photos? Add a word like 'grocer'. For the best ones add 'rating4'
Photos are tagged with Ordnance Survey national grid 1km SQUARE references (e.g. SD9013) , so you can search using those too.