Interior sketch using simple pencil lines to show shading. This again works well to show layout but not necessarily texture and colour. However, it is possible to add a textured look using just pencil.
El Chorro by Luis_Ruiz, via Flickr
Hot Digital Art by Chong FeiGiap
Urban Sketchers Spain. El mundo dibujo a dibujo.
Stuff Protruding from ceiling (like inverted furniture / room but not quite) - Living Room by vanessamsoares
Kim Jung Gi - Masters of Anatomy
Perspectiva centro comercial