A smaller project costs more per foot than a larger one, plus you probably have a change order fee incorporated into it if that wasn't what was planned from the beginning. My good tile guy charges around $15 a foot for a simple backsplash. Even with the change order fee of maybe $200, plus the GC's fee on top, your quote seems out of line for ceramic. Glass would be more, but not even that much!

We are not new build, but are demoing existing backsplash 60 sq feet, re-dry wall, new backsplash install labor and dry wall materials is 950.

My BS was about half that size, and I used 2x8s in a herringbone pattern (lots of cuts). It came in at 1000, which I thought was an excellent price, especially since the tile setters I used do very high end work.

Gee, between my kitchen being small and my location I must be doing good on labor! I don't have a breakdown, but considering the work to be done and the price, my 30-ish sf must be less than what's above.

My contract says ceramic tile of my choosing, but I want a mosaic in 1sf sheets, MOP. That's easier to do than individual ceramics, right?

$2100 sounds a bit steep for ceramic. I have 35 sq feet and was quoted $985 for full backsplash and design above range for Durango Creme Travertine installed at 45 degree angle. I haven't installed my BS yet, but am now considering glass subway tile. Are you able to get 3 bids?