Small shed ideas tool-shed-with-stain-and-cedar-trim
You can also affix the PVC tubes to the wall as neat hanging racks (Love For The Laundry Area) - 53 Seriously Life-Changing Clothing Organization Tips - Some ideas are more useful than others
Kitchen or anywhere DIY. Seems simple enough, depending on your gap between shelves, anywhere from ropes to ropes for your spacing. You could even use wider wood, just adjust your rope length to accommodate your width and height of your shelves.