These were all done with Dal's 100 white. The hex was American Olean, but I can't remember the color name. I know it was their flat white, though. In fact, it was done for someone who found me here in this forum (although I don't know their forum name!)
(oh, and BTW-- before I get the comments from the pros in here, the wall grout was not completely dry when these pics were taken. :-) )
Q