An ornamentaldesign for a suction cup wreath holder, as shown and described.
FIG. 1 is a front view of my suction cup wreath holder;
FIG. 2 is a right side view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a back view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof; and,
FIG. 7 is a front isometric view thereof.
The pull tab shown in broken lines in FIGS. 1 and 3 through 7, the support rib shown in broken lines in FIGS. 2, 3, and 7 and the two inner circles of FIG. 4 shown in broken lines are features that form no part of the claimed design.