Maybe a stainless or metallic tile? If you have even 4 tiles left from the original, you could make a diamond pattern on the center of the space surrounded by metallic tiles so it flows. Or remove a whole section behind range, and use those tile remnants to make a cracked tile border to frame a different tile.

If you removed the tile behind the range you could replace it with a sheet of stainless steel, but here's the thing....is your range hood going to be stainless steel? If so, cover the exposed wall with a small strip of stainless steel and leave the tile alone. It's the easiest fix, and it will look fine. Your tile has some thickness to it, and stainless is thin, so you'll have to mount the metal strip on a wood spacer of whatever that thickness is, in order for the stainless to be flush with the tile and the hood.

I guess if I were you I'd continue the search. Can you pry off one tile and see if there's a name on them? They just look so familiar. . .here's a link with some blue grey glass tiles.

https://www.pinterest.com/pin/150237337544889706/

Oh don't do that! Glass tiles break, chip, splinter, just ask the middle finger on my right hand. I had to have surgery to remove glass shards left behind after I cut myself removing glass tile from my bathroom. If it is mortared into place leave it alone!

I'm with EAM. A stainless steel sheet unless you can locate the exact tile. They also come in patterns.

Other options: stainless steel tiles or totally different tiles, but I have to say in my opinion it's not worth it..

Maybe a caustic tile look.