A decorative object, most conveniently embodied as a decorative pillow, is constructed to maintain a substantially fixed spatial relationship to a supporting substrate within a vehicle interior while not requiring the use of fastening means. The supporting substrate may comprise a vehicle seat. A decorative pillow is provided with a surface or surfaces providing ornamentation. Components in the interior of the pillow interact to function efficiently as a fill chamber and a ballast chamber. The ballast chamber may be positioned to avoid engagement with surfaces exposed to a user. Ballast provides for inertia so that the pillow will tend to stay in place when acceleration forces are applied thereto.