Here are some downloadable paper miniatures for an old Japanese console game called Suikoden. They’re perfect for an anime style game.
Dream Weaved Worlds has some very nice free print-and-play dungeon tiles.
The Japan Agency of Marine Earth Science and Technology offer a page of free, downloadable paper models of sea creatures and research vessels. Properly scaled, they might be useful for a Thunderball type skirmish game, if anyone ever makes a few 28mm 1960s era scuba diver.
Here are some paper models of “Terrors of the Deep” — aquatic horrors to threaten your heroes.