As used to trim a corner where a wall and a ceiling meet, a crown molding member has a planar portion, an intermediate portion, and a mounting flange. The planar portion is attached to the ceiling, in a first mode, or to the wall, in a second mode. The intermediate portion may have a coved, stepped, or curved profile. When applied to the mounting flange, drywall-finishing material, so-called "mud" in trade parlance, is pressed through apertures in the mounting flange, against the wall, in the first mode, or against the ceiling, in the second mode.