From the Adorama YouTube Channel:
A textured wall in your studio could well be the perfect background for your portrait photos. Even a slight texture can add the feeling of depth and interest to a portrait that a plain wall often can't. Of course not many photographers have the space of a permanently textured wall, so in this video Gavin Hoey walks you through a shoot in his small home studio, where he plans to replace a simple, smooth fabric background with some texture.
After the shoot, Gavin takes you into Photoshop where he passes on some simple tricks to add a gentle texture over the original portrait. He then goes on to blend everything togther by means of a quick color toning technique.
If you're looking to enhance a smooth background with a small amount of texture, this technique opens up a whole new world of background styles.