I got this email from Paul today, and I didn't have any good answers off the top of my head, so I though I would throw it out to the crowd for and answer. Paul asked;

Our house was built in 1951 and it has two bathrooms that were done in Carrera Glass blocks....or vitrolite. Some idiot in 1982 when the second owners bought it decided to smash several of them to install new towel racks and they have covered all of the glass with a layer of clay like plaster and then they wall papered the walls. I really like the tile HEATH Ceramics in Calif has but who can afford them? I also like ModCraft. But there seems to be a real shortage on mid-century modern tile. Do you have any ideas for us on a source for tile?

Any good ideas?