We have a shelter made from pallets and corrugate plastic roof - round posts banged into ground, pallets put ontop to form side - 3 pallets deep and 4 pallets wide, 2 pallets high. Rail for post and rail fencing screwed to pallets to secure. Rails screwed across top and plastic fitted to this. Currently used as a hay store but could be used as a shelter too with hurdles across the front. Can fit 60 or so small hay bales in it. Will try and post pic when it stops raining