A camouflage cover for equipping an outdoor enclosure with three-dimensional nature effects includes a plurality of elongated nature-effect strands that drape over the enclosure in a substantially vertical arrangement. The vine-like nature-effect strands help conceal hard lines and corners of the enclosure structure. The cover may include adjustment straps that allow a single cover to adapt to a number of enclosure structures. The adjustment straps, where used, may include interwoven cords and cord locks for adjusting tension of the straps. The nature-effect strands may have different camouflage patterns so that an enclosure can have an appropriate camouflage scheme no matter what season or environment. Tiebacks may optionally be used to permit horizontal adjustment of the nature-effect strands, in order to prevent allow free access to windows and doorways. Auxiliary loops may also be provided to allow attachment of additional nature effects by a user.