Stack of junk? 
Hidden garden
Some of my starts had outgrown my indoor green house so I needed to move them outside. I needed to harden them off and I still needed to protect them from the wind, rain, and chickens. Cold frames seemed to be the answer.
I had never built one before but I needed one quick. I laid out four hay bales leftover from winter feed and set the plants inside on the ground. I have a piece of clear polycarbonate that I rescued from someone’s bulk trash day, a hardware cloth panel from a coop we took apart, and a tiny skid. The poly covers the plants overnight and when it’s chilly. The hardware cloth keeps the chickens out when I can take the poly off or it sits on top of if to keep the wind from lifting it. The skid provides dappled shade through the day and adds weight on windy days.
Cost of project: time