I recently put together a floral arrangement, well two as an introduction into fall. When I went looking for flowers, Halloween, especially was on my mind. I was actually looking for any dahlias, or even dark tulips but there was only summer colors avail. As a general rule of thumb, I stay away from Roses, just because roses can over or underwhelm an arrangement. Mums are my go to, because they do well, with limited sun, and are fully displayed.
PS. I think these are one of my favorite arrangements.