Create a vibrant, intricately detailed Tibetan-style rainbow mandala with a dark green Ohm symbol at its center, surrounded by layered, swirling patterns of turquoise, saffron, and crimson hues, radiating outward in a harmonious blend of sacred geometry and spiritual symbolism, set against a BLUE background that subtly gradated to a warm golden tone at the edges, with delicate, hand-drawn lines and subtle texture evoking the feeling of aged parchment or handmade paper.