Focusing on Shape/Structure:
* A coiled spring: Emphasizes its bouncy, resilient nature.
* A tumbleweed of tendrils: Highlights its wild, voluminous look.
* A tangled forest: Points to its dense, sometimes unruly character.
* A sea of waves: Captures the undulating, fluid movement.
* A corkscrew carnival: Emphasizes the tight, playful curls.
* A birds nest of beauty: Highlights the complex and intricate arrangement.
Focusing on Texture/Feel:
* A cloud of silk: If it's soft and fine.
* A wiry labyrinth: If it's coarse and thick.
* A textured sculpture: Highlights the artistic and structured form.
* A fleece of dreams: Implies softness and comfort.
Focusing on Personality/Association:
* A crown of rebellion: If it's associated with independence and free spirit.
* A halo of sunshine: If it's bright and golden.
* A statement of individuality: Emphasizes its unique and expressive quality.
* A wild child's mane: Suggests a carefree and energetic personality.
More Evocative/Figurative:
* The alphabet soup of my ancestors: Suggests a rich and complex heritage.
* A conversation with gravity: Captures the way it defies straight lines.
* A symphony of spirals: Highlights the beautiful and harmonious arrangement.
* A garden of possibilities: Emphasizes the versatility and potential of curly hair.
The best metaphor will depend on the specific type of curly hair you're describing and the effect you want to create.