You mean something other than cutting out the individual tiles (from the sheet/mat) and then hand setting them and thereby paying a HUGE amount of money for the extra time (triple or quadruple) the tile setter will require to hand set a small mosaic glass tile? Nope....can't think of anything OTHER than doing everything by hand and paying double the cost of setting this in a herring bone.

A proper herring bone requires a tile that is twice as long as it is wide. Your tiles do not meet this "minimum" requirement for a herring bone. Your tile setter will be fighting with this for hours and hours and hours and hours...could be days in the making. You will pay for every second of that "fight". S/he could waste as much as 50% just trying to get this to "work" (I would bet on having to purchase twice as much as you think you need). And then the randomization of the individual tiles will have to be done for the tile setter. that is the designers job (if no designer than the job falls to the homeowner = you). You will need to hand-draw a full pattern layout before s/he picks up a trowel.

The cost of this would be tremendous and it probably won't work (as in "ugly as sin" leaving you "angrier than a wet hen" and a tile setter who will never speak to you again). It would be cheaper/easier if you remove the old back splash and replace it with the "newer" version of the tile and move on. It will save you thousands of dollars in labor.

Good luck.

LOL!!! I bet every experienced tilesetter has a long list of clients they don't speak to any more!

I appreciate your response. And yes, for sanity's sake if nothing else, I recognized that the manual approach wasn't practical so I had asked if anyone knew of a mechanical way to convert tiles to the herringbone arrangement on sheets for ready installation. But it looks like nobody does! So maybe there isn't such a thing. Oceanside does offer many tile arrangement patterns, so they must have machinery to put the tiles in order on the backing. But herringbone isn't currently one of their patterns. Maybe that's related to the size ratio issue you mention.

At this point, I think I'll probably go with your suggestion to cover the entire backsplash wall with one type of tile (like I should have done in the first place, lol) instead of trying to add on. But that means removing the glass tiles now on the wall. Since I love them, that will throw me into the tizzy of trying to save them somehow..... In addition to the ground tile, the current back of the cooktop backsplash includes a band of four art glass panels which were made in a cast Minoan design that is no longer available. (internet picture, mine are a different color)

I used them on the other side of the kitchen so I'd really like to conserve those, and maybe even include them in the back of range segment of the "new" backsplash.

All mosaic tile is hand set on mesh backing by little Chinese or Indonesian kids. There is no ''machine''. SMFH

Hmm...I will have to consult with Oceanside on this -- I think their factory is in Mexico. I did email them this question a while ago, and didn't hear back so it's time for a followup anyway.

Any possibility you could lay the tile vertically (literally just rotate it 90 degrees) to camouflage the size difference?