Illustrate an image of white sands New Mexico sand dunes with the shimmering, icy sands of an otherworldly desert at dusk. The sands should reflect a cool, purplish hue, with a subtle iridescent glow that captures the fading light of the sunset. The sky above is a gradient of soft oranges and pinks blending into deeper purples and blues as night falls. The scene should evoke a surreal and eerie atmosphere, with the reflective, cool-toned sands.