The ornamental design for a cross-shaped display stand, as shown and described.
FIG. 1 is a top right-hand front perspective view of a cross-shaped display stand in accordance with the present invention;
FIG. 2 is a bottom right-hand front perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a right side view thereof, with the left side view being a mirror image;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
Where included, broken lines showing environment are for illustrative purposes only and from no part of the claimed design. Where included, dot-dash lines represent the border between claimed and non-claimed subject matter and form no part of the claimed design. The drawings illustrate the claimed invention, and are not intended to limit the claimed invention to the scale and proportions depicted.