Flower arrangers – ornamental grass (SG17 (Shefford))

I need to do some hand-to-hand combat in my garden, including cutting back the grasses for the winter.

Before I do, I wondered whether the feather seed heads pictured would be of any use to someone who arranges flowers? These could be handy, especially if you have tall displays to do - some of these would be 3 to 6 feet tall (though of course could be shortened)