Photoluminescent particles are integrated in gravel floors creating a seamless surface. As such the material adds ever lasting after glow effects to a wide variety of colorful gravel flooring combinations. The particles can be evenly distributed over the surface or grouped in patterns like circles, lines or arrows, thus providing additional safety features in the dark. Unobtrusive at light, photolum upgraded gravel floors blend well with interior design, unlike traditional floor markings. Typical applications are offices, lobbies, libraries.