The thicker the tile, the less appealing it will look. What is the size of this tile? Small thin tile could be adhered to the wall without it looking too absurd, I guess. Can't you remove one row and replace it with the correct tile? The quicker you do it after the initial install ,the better it is. Most tiles can even be removed the next day with little wall damage.
Next time, put the actual tile layout on the counter, especially if the design is as suble as it seems.
Ron
Next time, put the actual tile layout on the counter, especially if the design is as suble as it seems.
Ron