banner 4x1 for website and social networks close-up of white birch trunk with curl of birch ba

webdesign social networks pattern forest nature rough material wooden abstract surface organic textured gray timber design backdrop striped grunge lumber outdoor peel winter spotted brown rural ecological rugged cold landscape decor stem environment structure sample betula fragment beautiful copy space simple spring cracked fissure lichen lapland ageing monochrome element drawing creative banner 4x1 close-up white birch trunk curl bark for website