The ornamental design for a stonecushioningblock, as shown and described.
FIG. 1 is a perspective view of a stone cushioning block showing our new design;
FIG. 2 top view thereof;
FIG. 3 is a front end view thereof, the rear end being a mirror image;
FIG. 4 is a right side view thereof, the left side being a mirror image; and,
FIG. 5 is a bottom view thereof.
The broken line showing of the recesses in FIGS. 1 and 3 represents environmental subject matter and forms no part of the claimed design. The block is shown broken-away in FIGS. 1, 2, 3 and 5 to show no particular length.