I saved several window screens when I had windows replaced and wanted to do something with them.
Ann: maybe these ideas will help
Some people use them to display jewelry: http://theborrowedabode.com/2011/01/tutorial-window-frame-jewelry-display/
Instead of spending money trying to transform them, you could post an ad under 'Free Items' on Craigslist. Folks use second hand window screens for fixing up summer cabins and cottages.
Hand-made-paper making requires screens.