Prompt: Design an exquisite user logo within a perfect circular boundary, filled with a vibrant nebula cloud formation as the primary element. The nebula should feature rich and elegant gradients, with blue as the main color amongst a kaleidoscope of vivid shades. The design must embody minimalism and sophistication, with a clear silhouette of a person seamlessly integrated into the circle, representing a user profile. Emphasize the nebula's textural detail to convey a sense of organic creativity, while maintaining the gradients subtle to give the logo depth and a refined aesthetic. Ensure the white background to highlight the logo's purity and the striking colors of the nebula clouds.

Style: Digital Art