My apartment is one of the few in my building that faces an open courtyard. People stand across from my apartment, waiting for the elevator and facing my front door. As a result I like to decorate my door. In past years I've gone to Christmas tree lots and asked if I could have some of the branches they cut off people's trees. I was frequently told I could take what I wanted at no cost as the employees appreciated the fact that they didn't have to clean them up. I then tied them together and made a wreath for my door and decorated some of my doorways. It brought the smell of a tree in my apartment without buying a tree. This year I decided I didn't want to do that though, so I instead used things I already had around the apartment. I gathered a dry cleaner hanger, a bunch of random plastic bags in various shades of green and blue, a twist tie (from a bulk bin purchase) and a mesh bag from oranges and pulled together a wreath!
I used pliers and wire cutters to resize the hanger and make a smooth-ish circle. I cut the plastic bags into similarly sized strips and then alternated colors in a semi-regular pattern. I used probably about 7 bags, but most were much larger/thicker than a normal grocery store bag. You could easily do something more striped or a single color. When it looked full enough to me, I tied a bow with the mesh orange bag and attached it to the wreath with the twist tie!