Design a detailed close-up image of a small flea-infested area. The flea should be nestled among fibers and altered to have a vibrant green hue and elongated body shape. The fibers, representing the infested area, should be depicted in shades of white and light blue. Maintain a high level of detail to showcase the texture of both the flea and the fibers. The background should be a subtle gradient transitioning from deep grey at the bottom to soft silver at the top, creating a mysterious and slightly ethereal atmosphere.