Instead of glass tile or square tile, here is round stone like accenting

Same size tile pieces but with variations in color application to get a different tile accenting

Ever thought of a vertical accent line? Could be applied on any of the 3 walls...

Diamond tiling on the bottom, natural colored accent tile line, square tiling across the top

Instead of just an accent line at eye level you can add another towards the bottom of the wall

Have the accent tile run across the top and also at eye level

This shower has 2 different sized tile pieces but still has the color difference to have the accent tile look

Here the accent tile line is below eye level

Here the double accent lines are a little more closer together and the accent tile is larger

Glass accent tile with color variation

The accent tile is a rectangle shape to offset the larger square tiles

Here there are 2 thicker accent lines instead of thin lines

Add a double accent line instead of just one

Glass accent tile with color variations