abstract seamless modern presentation background .

abstract art backdrop background banner black border brush brushstroke collection curly curve decoration dirty doodle drawing drawn frame grunge hand ink line lines marine modern ocean paint paintbrush pattern scratch scribble seamless set shape sketch stripe stripes stroke summer template texture textured tribal vintage wallpaper water watercolor wave wavy white blue back tangled abstraction logo idea children painting concept skills beginner work circle symmetry flower branch invertebrate coral design font azure purple frost leaf underwater