After much debate and concern, I picked out a grout color.
The color had to be light enough for the tiles to blend together but dark enough so a lack of cleaning (this is the man bathroom) will not be noticed.
This picture hit my inbox yesterday:
The floor still had the "just been grouted" haze in this picture.
Oh, and the threshold got installed too (after equal amounts of debate and concern)! Maybe this weekend I'll get some paint on these walls and the tub tile grouted too (I'll also throw in a toilet install on the list of things to do).