In additon to the guest bath, we completely gutted the master bath — boy what a mess. I'll spare you the photos, but the luan plywood behind the tile had seen better days.
We used the same 3X6 white subway tile hung in the same way. For the curb, I used the matte aluminum Schluter tile strip instead of bullnose for a cleaner edge on both sides of the matching 6X6 tile. The geometry is quite nice.
We used Dal-tile's "Charcoal" keystones blend for the floor with Delorean Gray grout and love the combination... I might even re-do our own baths in this combo.
We used Denshield tile backer and ran it along the wall behind the toilet and replaced the paneling adjacent to the toilet (scarred from old repairs). Previously, the entire room was wrapped in wood — a very bad idea for a wet area. Now, the paneing is just serving as an accent far away from actual water.
I finished up the grouting too late for any proper photos, so here's a few iPhone grabs.