If you want to grow a plant that makes a huge statement, try sorghum, or milo. I grew it last year, and it grew 10' tall. Every day, I'd pull down a head and just leave it bent over on the ground. The flock would attack it.
I read an article with pictures, on growing sorghum, amaranth, and sunflowers together in a border. I prefer the shorter varieties for grain, but I would like to plant such a border. I imagine that a border like this would be good for attracting insects to.