I am renovating a bathroom. I have decided on a tiled shower but would like to have shelving recessed into one of the walls. I have heard that there are one piece (fiberglass?) shelf units that can be set into the tile wall. The purpose of which would be to avoid standing water eventually leaking through a crack in the tile grout.

Hi Kitty, We are doing the same thing. Go to
http://www.aquafit-usa.com/ THey have three sizes of built in's that you put up and tile. Hope this gets to you in time for your project.