1. Vertical lines draw the eyes up. If you've got a focal point above, consider pointing your tiles in that direction. Here, they seem to flow right up into the matching sky.
In this kitchen, the backsplash color and cut work with the vertical alignment to draw your gaze up to that handsome hood.
By drawing the eyes upwards you turn this fully-tiled fireplace shaft into a more dramatic gesture.
2. They create the illusion of height. In rooms with low or pitched ceilings, the vertical lines will help to visually elongate the space.
Continuing the tile on the ceiling, as shown here, furthers the illusion of the wall being taller.
3. It's an easy way to add interest. Rotating the tiles 90 degrees was just the touch needed to set this kitchen apart from the pack.
See what I mean? With a twist these subway tiles look totally fresh.
4. Take a unique tile to the next level. Not only does it skew the classics, but it gives even more cache to a less common tile choice.
Wowza in red!
5. Unify your lines. The vertical application unifies the main tiles with the accent tiles in this shower surround.