I think you might like silk/faux silk curtains and they are quite glam and would add a nicely different texture to the room. Not sure about your overall scheme so difficult to know what colour or pattern might work.
Ooh thanks very much, so sorry I didn't come back to the thread earlier, I thought I'd had no replies. I will have a good look. Don't really have an overall scheme as am happy to build around the sofa/curtains!