I claim the ornamental design for a folding dice tower, as shown and described.
FIG. 1 is an elevated perspective view of the dice tower of the claimed design, positioned over the side of a dice tray;
FIG. 2 is an elevated perspective view of the dice tower of FIG. 1;
FIG. 3 is a front view of the dice tower of FIG. 1;
FIG. 4 is a back view of the dice tower of FIG. 1;
FIG. 5 is a left side view of the dice tower of FIG. 1;
FIG. 6 is a right side view of the dice tower of FIG. 1;
FIG. 7 is a top view of the dice tower of FIG. 1;
FIG. 8 is a bottom view of the dice tower of FIG. 1; and,
FIG. 9 is an elevated perspective view of the dice tower of FIG. 1, in a folded and collapsed state.
The broken lines in FIG. 1 showing a dice tray are for the purpose of illustrating environmental structure and form no part of the claimed design; the broken lines in FIGS. 1-3 and 9 showing a logo also form no part of the claimed design.