Recommend a tall green shrub for privacy?

I recently moved to a new house and am doing up the garden bit by bit. In one raised border which is a particularly overlooked corner of the garden I've planted some bamboo, and because I don't yet have a vegetable plot I planted some potatoes in the space between a golden bamboo and an arrow bamboo. The potato plants grew really tall over the summer and I was surprised at how attractive they looked beside the bamboo. Now they're dying off and the potatoes will have their own raised bed next year, I'm looking to replace the potato plants with something permanent that looks similar. I'd like it to be:

- Fast-growing
- Tall
- Mid- or dark green foliage, preferably with round or wide leaves (the wide dark potato leaves looked really attractive against the pointy yellow-green bamboo leaves)
- Flowers not needed, but I wouldn't mind a plant that flowered for a short time
- It would be nice if I could find something that was partly tall and partly "weeping" (again to make a nice contrast with the upright bamboo).

The spot is against a white east-facing wall, sunny in the morning, shaded in the evening, and also shaded by the tall golden bamboo.