PIPE frosting on adjacent edges of 4 crackers; place crackers, top side down, on wax paper to form a large square, pressing edges together. Attach 4 more crackers, top sides up, on top of first square with frosting. Let dry.
PIPE frosting along 1 edge of 2 crackers; place top side down, side-by-side on wax paper, pressing edges together. Attach 2 more crackers, top sides up, on top of first 2 crackers with frosting. Repeat to make another rectangle. Let dry.
ATTACH 2 crackers, back sides together, with frosting. Repeat to make a total of 4. Let dry.
TO assemble, with a straight pin, pierce 1/8-inch hole in large square piece about 1/4-inch from one corner for ribbon.
STAND 1 rectangular piece along center diagonal of large square; attach with frosting. Stand 2 small square pieces at right angles to rectangular piece; attach with frosting. Let dry. Repeat on other side of ornament.
PIPE frosting around edges of ornament and dip in sprinkles as desired. Thread 10-inch piece of ribbon through hole and tie about 3 inches above ornament.