I prefer flat over beveled, especially with a patterned tile. I was always under the assumption that bigger tiles (floor tiles, anyway) makes a room look bigger. I'm not sure about backsplash tiles. Post some pics of your kitchen (or cabinets, countertops & floor) with some tile samples. You'll get more responses when pictures are involved.

I googled 152 mm x 75 mm wall tile uk and came up with many results, including the following. There's all kinds of stuff, including the very beautiful and expensive Craven Dunhill. But you can work your way up to that on your own! Try to find a big company that has local dealers near you. You might even find that a big tile manufacturer makes many lines and many names, and is nearer than it appears, and you could drive there and load up. Wouldn't that be nice? It's worth poking around a little bit. (I know I have seen this kind of tile in the UK. You could substitute IT, SP for whatever country you like to see their results.) They may ship to you, or consider a little minibreak on one of those cheap euro airlines. Even charging for luggage, meals, bathrooms and air, you might come out ahead. Or maybe someone wants to visit you by train? Another thing someone on this board suggested to me once was having a very white, shiny, featureless marble cut into the right size pieces. Or are you all marbled-out in Greece! Good luck! Here is a link that might be useful: Just a sample of the stuff out there.

I just ordered a few individual tiles from Mosaic Tile Stone. I am not sure if they are beveled or not, but they have both honed and polished. I was also excited to find a porcelain calacatta look alike and haisa light marble. I was able to order both of those too. Here is a link that might be useful: Mosaictilestone

I agree with all of you who settled on the metal strips and with Michael who says it looks great. After hours of research and going out to search for the right finishing trim in ceramic, porcelain, marble, stone, you-name-it, for my white beveled subway tiles, I came across a gentleman in a store who advised me to take a look at the metal edge transition strips for tiles at a neighborhood tile store. I finally settled on a curved (not straight or squared edge) bullnose satin nickel stainless steel trim to hide the unevenness of the thickness of the tile cuts, avoid any chipping, and also to match my bathroom fixtures. My white beveled subway tiles look beautiful! The store had a sample shower niche with the same bullnose metal edge and it looked very nice and modern and had a clean finish. Best to you on your projects!