Hold on to all your 1 gallon plastic milk jugs throughout the year. At Christmas fill all the jugs 1/2 full of plain tap water. Set them around the perimeter of your yard (or along your walkway). Using a string of colored lights (3.99) Place one bulb in the top of each jug and secure it with tape. When the lights are turned on the whole jug glows with whatever color bulb is in it and you have a very inexpensive and festive holiday fence.