Planning for winter

Hi, ive been veggie growing 2 years now and always considered flowers a waste of time, until this spring that is, and after growing a lot of flowers myself to save money i'm looking for ways to plant up my pots stylishly this winter. So far I have cineraria growing and I have a smally curry plant that i'm hoping to propagate from.
Ideally i'd like to stick to a silver/red/black/green colour scheme so i'm looking for suggestions as to what plants i could grow from seeds now that would fit in.
Any ideas if i can get some seeds for black grasses cheaply form anywhere?
Also how do I take cuttings from ivy to increse my stock for around the edges of my pots, I have 3 or 4 little clumps do i just divide?

Thank you so much for your help, i'm a bit of a lurker but have found this forum invaluable and so inspiring.Oh and sorry for the long rambling post.

Amy