colorful geometric background with triangles. seamless repeatin

abstract abstraction background blue color colorful construction cover decor decoration decorative design diamond element fabric fashion form geometric geometrical geometry graphic gray grid hexagon illustration lozenge modern mosaic ornament pattern periodic print red repeat repeating repetition retro rhomb rhombs rhombus seamless sexangle shape square structure style template texture textured tile trendy triangle triangles triangular trigon vector wallpaper wrapping