How can a grid mesh be unwrapped to overlayed quads? I have a grid mesh on the floor and want to UV map it to an image of 2x2 tiles.
I remember that there was an option which allows it to map all quads over another, but I no longer know what the name of the menu items was.



Between the tiles are joints (in case this makes a difference), detail view:
Starting with an unwrapped grid (without the joints), press U in Edit Mode to bring up the unwrap popup and chose Reset:



After scaling down all UVs to the size of a single tile they can be distributed by repeated Random Deselect from the Select Menu in Edit Mode