Mounting clips and decorative mounting articles removably engage to vertically disposed mounting surfaces, such as rain gutter downspouts. The mounting clips support arms, hooks, plates, decorations, and brackets for display of banners, flags, security lights, decorative lights, etc., on a downspout or other comparable mounting surface. The mounting clips include a frame having arms with projections separated by channels configured for attachment to a profiled outer surface of the mounting surface. Decorative mounting articles include a rear section forming channels having inner sidewalls with engagement portions configured for direct attachment of the decorative mounting article to a profiled outer surface of the mounting surface.