I wrote this in class when I was about twelve. An OHP with the silhouette of a small, pixie-like child was presented to us and we were instructed to write a story according to the picture. This is what I came up with. It's always kind of been a favourite of mine.
I have polished the writing but the story is exactly the same. Please excuse the overly sentimental writing- I was twelve at the time!

  “They won’t even know when I die,” whispered Felix softly to herself. She gently touched a finger to the lake’s surface, creating a ring in the water which spread swiftly to the bank. She gazed to the centre of the ripples, child's eyes fascinated by how her thin finger could make such a disturbance so easily. Stretching out her arm and plunging a dirty wrist into the water’s depths, she playfully attempted to grip one of the shimmering rings. Shuddering from the icy sensation, she withdrew her hand, droplets falling from it to the soil. 

  A crow gave a last caw as dusk began to fall, and Felix laughed in delight at the sound, rising to her feet and imitating the bird’s call, flapping her arms and squawking. She was free, free! And she began to dance, a wild dance of delight and freedom. The stars smiled and played their music for her, and the child danced to their music, round and the old willow tree, bare feet leaving patterns in the dust.

  “Free!” she cried, scattering flocks of birds into the gradually darkening sky. She ran to the water’s edge, kicking pebbles excitedly. The ripples from the pebbles swelled, and Felix was all of a sudden silent. She gingerly shuffled to her stomach, wincing slightly, and lay on the lake’s bank, her eyes reflecting into the water and staring back. She waved, and the girl in the water waved back.

   “I will save you!” Felix yelled.  “I have my deadly sword,” she said, taking a length of wood from the dirt and rising to her feet once more. “And my trusty shield!” Felix squatted at the edge of the water and poked her finger in, waiting until the rings grew large before reaching her arm forward. She closed a forefinger and thumb on one of the ripples, and calmly lifted the shimmering hoop out of the water. It was lighter than air and took no strength to lift. The cool touch of it left a numbing sensation in her finger which spread throughout her body, but she was too happy to notice. Soon, it was gone. 

  The girl trapped beneath the water forgotten, Felix felt light and easy, and resumed her dance,  bones jutting from white limbs as she moved. Twirling and bowing, twisting and spinning, shining like a lost jewel in the air, she forgot the bruises on her face and arms. The silver ring joined her dance, tossed from arm to arm, dancing with her. 

  The sky slowly turned to black and shadows fell on Felix’s form. On she danced, through time and space, over the lake to the forest, feeling the leaves from the treetops tickle her feet and the touch of music on her ears. Past the stars and onwards, disappearing into the dark, she smiled, closed her eyes, and knowing it was over, let go.

  Down by the lake, a thin girl’s lifeless body lay in the dust and dirt, ugly bruises tingeing her pale skin, clutching a bicycle wheel tightly to herself.