set of paper mockup cards with colorful polygonal backgrounds. made of shiny triangles for invitation, web pages, apps, party

paper card set silver gold grey golden blue turquoise white shiny triangles polygonal triangular year winter empty space copy textured metallic foil bright light vector background geometric polygon abstract modern design shape pattern mosaic triangle template futuristic technology luxury wallpaper texture graphic decoration yellow colored geometry mockup cards colorful backgrounds invitation web pages apps party flyer simple design