Gap filler tattoos are a growing trend in the world of body art. They are typically used to fill in gaps between other tattoos, or to create a decorative pattern between two larger tattoos. As the name suggests, gap filler tattoos are not meant to be the main focus of a sleeve or other tattoo, but instead to fill in the gaps between existing tattoos. Gap filler tattoos can be anything from a simple line or dot to a more elaborate design, and can be placed anywhere on the body.