Purple boxes

On our trip this past weekend, we saw these purple boxes hanging from the trees.  They were about 3 feet tall with a triangle top and bottom.  They were on Rt. 160 and 219 in southern Pennsylvania and we saw some last year along Rt. 40 in south-western Pennsylvania.  Sorry the picture is so blurry but this was taken with my phone while riding on the back of the Harley and we were moving. 

Purple box

Purple box...why?


So does anyone know what these purple boxes are? 

I decided to change the buttons on the white sweater from the ivory square ones to round white ones.  No pictures as I don’t have them sewn on yet.