Hidden winged creatures

Strange creatures the size of a hand, with transparent bodies that sparkle in the sunlight as if they were made of stained glass. Its wings are thin and long, like those of dragonflies, but they are covered in a layer of soft feathers that constantly change color between bright blue and dark violet. Its eyes are small and glowing, and its movements seem fast and unstable, as if they disappear and reappear in different places in moments. When they fly, they leave behind a trail of glowing dust that slowly disappears into the air.