I was doing some googling for some stock art for my card game (wanted free photo's of cities and skylines to use as Location cards) and came across an EXCELLENT listing of free materials for any purpose, is very nice. One page is ALL Japanese pictures (from someone's trip to Japan, some VERY nice shots of various temples, cities, parks etc). I'm sure there'll be plenty of material for a lot of people ^_^
http://search.creativecommons.org/
Deal is, on like 95% of it, you simply must give the author of the work credit. Double check before using anything of course, but its still a great deal.