As with many interior design options, there are no obligatory rules to follow when determining which living room wall will become your showpiece. Generally however, feature wall design begins with locating the space to which your eye is naturally first drawn.
Interestingly, this doesn’t necessarily equate to the largest expanse of wall in the room – a common living room feature wall misconception. Depending on your room’s angles, the doorway and the natural path you’d follow around the room, it might be that a smaller section of wall is where your eye first falls.
Another key determining factor is whether or not you wish to focus on an existing feature or to pull attention away from it. For example, if you have a suspended marble mantelpiece, you can use a feature wall to dramatise it, providing you use a colour that introduces high contrast; this means they act as a foil to one another.
On the other hand, if you prefer to shift the focus to a different part of the room, challenging what the natural focal point is, use a colour that will help the mantel to blend in, moving the contrast to a different area.