AutoTrail is a geometry nodes asset library for generating customizable trails in Blender 4.1 and above. The collection includes over 20 procedural trail effects, ranging from basic glows and popping bubbles to heavy water effects utilizing remeshing and comic book-style onomatopoeia text. Users can apply the trails by dragging them from the asset browser and assigning a target object and vertex group. The setups work on both straight lines and curved edges. Additionally, a Blank Points Trail asset allows users to instance custom collections along a path, featuring gravity and noise controls to create particle-like behaviors.