blue grdient pattern backgrond, usable for social media, story, poster, promos, party, anniversary, display, and online web ads

abstract ads advertisement anniversary art backdrop backgrond background banner blue blur blurred canvas color copy creative design digital display elegant empty gradient graphic grdient horizontal illustration layout marketing media message modern online paint panorama panoramic party pattern plain pleasant post poster promos smooth social soft space story template texture tone trendy usable watercolor web widescreen