I just made 4 very simple bird feeders in one afternoon!
Top left: A soda bottle, 2 liter, cut in half and the top half pushed down on the bottom with a whole cut out. Then paint!
Bottom left: I reused the reddish orange netting from the oranges we bought that week. Knot the bottom put slices of fresh fruit, I did apples and oranges. Knot again on the top and hang. I used twine.
Top right: Empty Kool-Aid container. Just cut a few holes and paint.
Bottom right: strung cheerios, blueberries and tiny apple slices on twine and hang. The birds took to that one first.