Speaking of 40k, I'm curious if anyone has created a FOSS 40k-alike game, where every unit has a standard 3D-printable model that is itself a FOSS asset.
Not that that'd be too interesting on its own; but it'd almost certainly spawn a community of people creating and sharing derivative works of those standard models. Could be entire apps / package repositories / "character customization engines" built on snapping together standardized unit components like LEGOs and then printing the result.