We have just the opposite problem you have. For our renovation we need to use 3" tile and we would prefer 6". Our pool was originally built in 1970 and it's a freeform shape with a lot of tight curves. We didn't want them to have to cut that many tiles, so we spent a couple weeks looking for a 3" tile we like. I think we found one today. Now I just have to make a final choice on the Pebble Sheen color, and they can get started.

Our builder is going to use a matching grout to minimize the obvious lines in the tiles. Right now we have small (aprox. 2") dark blue tile with formerly bright white grout. We have a lot of trees, so the grout NEVER looks clean!