blackboard board class classroom education greenboard learn lesson pupils school student students teach wall background decay grunge home improvement plaster stucco swirls swoops texture textured textures venetian crops farm farmhouse fields forest house landscape norway norwegian rural stone woodland background texture blue blue door blue paint design desktop door paint wood city houses old town pavement sightseeing town walk walking walls window sill back backyard bricks brickwall dumpster Dustbin metal port ports stairs yard alone chair chairs empty floor loneliness quiet room silence silent solitude table yellow boat dock duero front line porto Portugal river washing water window abstract dust old painted rust rusty splatter spots stained weathered curved curves façade glass leaves mirror outside panes reflected reflection tree windows