BS VARI THERM TREAD 14"X72" 14" x 72" 2" Thermal Tread Variegated Bluestone can be very versatile and can be ordered in a variety of widths, thicknesses and surface textures. Typically comes in a blue-gray color but it is also available in a variety of colors that includes more earthy tones. Variegated color features full color with varied shades of blue, pink, grey, and brown.