The ornamental design for a columncover, as shown and described.
FIG. 1 is a front perspective view of a column cover showing my new design in a closed position;
FIG. 2 is a partial front perspective view thereof;
FIG. 3 is a partial rear perspective view thereof;
FIG. 4 is a partial front perspective view thereof showing the column cover in an open position;
FIG. 5 is a partial rear perspective view thereof showing the column cover in the open position;
FIG. 6 is a partial front elevation view thereof showing the column cover in the closed position;
FIG. 7 is a partial front elevation view thereof showing the column cover in the open position;
FIG. 8 is a top plan view thereof showing the column cover in the closed position; and,
FIG. 9 is a top plan view thereof showing the column cover in the open position.
Any broken lines in FIGS. 1–9 are for showing the environment of my new design and form no part of the claimed design. A middle portion in FIG. 1 is broken away to disclose indefinite length.