The ornamental design for a cross-shaped display stand, as shown and described.
FIG. 1 is a top perspective view of a cross-shaped display stand in accordance with the present invention;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a right side view thereof, with the left side view being identical;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The evenly dashed broken lines are shown for the purpose of illustrating parts of the article that form no part of the claimed design. The dot-dash broken lines illustrate the boundaries of the claim and form no part thereof.