Create a striking t-shirt design showcasing a large mandala pattern inspired by Indian art, intricately detailed and symmetrical, positioned at the center of the design. Surround the mandala with smaller cultural motifs, including Celtic knots and Aboriginal dot art, ensuring each motif is distinct yet harmoniously integrated into the overall composition. Utilize a rich color palette featuring deep blues, vibrant reds, lush greens, and warm yellows to enhance the visual impact and cultural richness of the design. The final artwork should be a digital rendering with a focus on symmetry and intricate detailing, featuring a transparent background for easy application on various t-shirt colors. Emphasize the theme of unity in diversity, creating a dynamic layout that appeals to those who value cultural heritage and artistic expression. The final design should be polished and suitable for printing, making it a perfect choice for individuals who appreciate the beauty of diverse artistic traditions.