This idea would be the ONLY reason I'd have a wire hanger in my house! Yes I'm a wire hanger hater! Bend a wire hanger in a circle and slide on cheap ornaments then hot glue them together as they alternate around the wire frame.
DIY No-Sew Ruffled Christmas Tree Skirt, made from a painter's canvas, cotton fabric, and hot glue! (I think I'd use cotton knit so it could be washed and not unravel.) My Crazy Life: I Pinned It, I Did It: Ruffled Tree Skirt