What would you do?

caulk it and forget it?
Trim?

Or skim coat the ceiling down.

Or if you used a caulk that matched the tile color it'd be less apparent.

Or fuggedaboutit.

We bought some composite trim last night and I am kicking up my faux skills. Will see how it looks when I am done.

I played wth some trim today. I think a little more brown and it will be fine.

Well yes it has been over 24 hours, and I don't have a mason's chisel.

I think I will leave them up there, and use my faux trim.
Lesson learned for next time :)

Not too bad for a first try:

I think once I grout/caulk it won't be noticed. Especially because the Mosaic will grab your eye.

In case you want to know how I did it so fast...

1. Purchased some cheap composite molding from Lowes (mold resistant etc, pre-primed) and had DH cut it.
2. Painted it with Valspar Stone Paint to add some texture. Found a color that was close to the light color on the tile. Let it dry.
3. Took a paper plate and sprayed some brown spray paint on it to create a puddle. I used the spray paint because it was what I had on hand.
4. Pat it on a paper towel then blotted the brown on top of the stone paint.
5. Applied the trim to the corners with the thinset.

I had done something similar in the kitchen but it took longer, but is probably more durable (and needs to be in the kitchen)

1. Mixed up some thinset in paint for base color and painted it wood mold trim. Let me that dry a couple days.
2. Did the same above with the brown paint
3. Coated the trim well with polyurethane before applying the to the counter edges.
4. Caulk well between the edge of the counter and the trim.

Here is out that turns out:

1. Mixed up some thinset in paint for base color and painted it wood mold trim. Let me that dry a couple days.

I'm really curious as to how you did it, and why you did it differently for the kitchen.

A couple reasons:

Mainly for durability. The kitchen counter edges would get a lot of scrubbing, water, knocks from pots & pans etc. I wanted it as tough has possible. Also I did not want to use a plastic molding in the kitchen for fear that heat from the oven or dishwasher may effect it's shape.

I had played around with several options for the kitchen when I finally came up with that one. With just paint it looked bad, I needed texture to make it resemble the tile. I thought about drywall setting compound, but since I already had an open bag of thinset I used that. Besides thinset is rock solid after it hardens.

I had plenty of time to do the kitchen trim, but I was in a hurry in the bathroom. I wanted to get the tiling all finished so I can grout this weekend.

I liked the idea of using the plastic molding in the bathroom because it won't rot. Since these are on the top of a shower enclosure they probably won't be "scrubbed" but wiped down occasionally. The paint held up well while I was doing my final cleanup of the thinest on the tiles & molding.

I actually planned on using the same technique with the thinset, but while we were in Lowes I ventured down the paint aisle and had a "ah ha" moment. I realized the stone texture paint would be quicker and easier.