A single decorative L-shaped corner overlay, not a full frame, not a square border, not a complete rectangle. The design must form one clean 90-degree corner only, with one horizontal arm extending right and one vertical arm extending downward, like a top-left thumbnail corner bracket. The outer structure is made of thick stylized bones, subtle skull elements, and carved organic forms, blending Celtic knotwork filigree with Native-inspired symbolic design. A dreamcatcher is integrated into the corner area, and the bone surfaces contain delicate scrimshaw engravings of a raven, wolf, and eagle. These details should be decorative accents within the bonework, not separate large animals placed around the design. The silhouette must stay clean, readable, and clearly function as a single corner bracket overlay. The area inside the L-shaped opening must be a solid bright neon green chroma key color, completely flat, with no shadows, no gradients, no texture, no glow. The rest of the image outside the decorative bracket should also remain the same solid neon green so the ornament reads as a single isolated corner overlay ready for alpha removal. Do not generate a full square, full border, picture frame, centered composition, or matching opposite corners. Show only one single L-shaped corner piece occupying the upper-left portion of the image, with open green space extending to the right and downward beyond it. Style is sharp, engraved, high-contrast, and slightly etched, using bone