I tried to make a bird feeder out of a plastic milk carton rather than just throwing it away. I usually have my milk delivered in glass bottles but occasionally when I run out I resort to getting a plastic carton.
I cut three holes in the side, and because seed would just fall out if it was vertical, I turned it horizontal. Also I made the holes big enough so a bird would not get its head stuck, made a little platform by bending the bottom edge down, and cut off any sharp edges.
Partly filled with Niger seed. Hopefully this will work, the handle was pushed over a vertical branch. Will check and make sure birds are OK…..