Remove pans from fridge. Using your cookie cutters as a size guide, cut pans into squares that will fit the cutters. Place a square on a plate or cutting board. Press the cookie cutter with even pressure, then -- while holding the cutter in place with one hand -- use your other hand to remove the excess gelatin from the edges. Carefully remove the cookie cutter and place shaped gelatin on a serving platter. NOTE: Invert the squares for the donkey shapes so the blue color is on top!