What (ceramic, granite, glass, melamine, corian, [arborite?], etc.) ceiling-tiles/materials make sense (especially in a bathroom)? How might they adhere and/or would they fall easily? How well would they resist some forms of water-pressure or help prevent mold/mildew and water-seepage/damage if, for example, a bathroom were to be cleaned by, in part, being sprayed, floor-to-ceiling?
I should start looking up at ceilings more. :)