Tiling images in 3d space help please

i am developing a E-catalog for one of the Tiles company.
i did a project in staticmode, but the user wants as dynamic . in future they can add a newest tile on their project . idid this concecpt using XML. but
i am Having one proplem . i generated one room . it conatins furnitures, and ground space. when the user clicks the thumb tile image the big tile image is to be fill in the ground place.all are work fine . i called all images from external source. but now they said to me . draw a gird and place each tile image to the grid . how can i do that?