Generate an illustration of a picture frame with a circus theme in a sober style. The frame should have a classic and elegant design, with subtle circus elements. Specifics: Material: The frame should appear to be made of polished wood or metal, with a dark, matte finish. Decorative Elements: Integrate understated circus motifs, such as tiny stars, subtle stripes, or delicate rope patterns along the edges, without overwhelming the overall design. Shape: The frame should be rectangular with rounded corners. Size: Medium-sized, with a width suitable for a typical wall painting. Color Scheme: Use neutral colors like black, dark gray, or deep brown, with minimal accent colors (e.g., muted gold or silver) for the decorative elements. Additional Features: Include small, vintage-style hooks or brackets at the top for hanging, and ensure the inner edge of the frame is smooth and simple to draw attention to the artwork inside. This frame should convey a sense of sophistication while subtly hinting at the whimsical and nostalgic elements of the circus.