Tiny Pebble Grown Massive in a Desert Mirage

"A tiny pebble grown to colossal size, its rainbow-hued surface glowing in a desert mirage with tiny glowing cacti, set against a bright, radiant sky with subtle mist curling, lit by a vibrant, multicolored pebble glow, fantasy art, ultra-detailed, vibrant rainbow colors, mystical atmosphere, style: surreal fantasy"