It's lovely, Orchid.
I am not sure whether you're doing the whole room or a feature area, ie alcove or chimney breast etc.
I wouldn't go down the purple route. Too dark.
I would look at softer tones and look at shades that were very close to that of the wall paper or just one shade lighter. This would set off the dark wood furniture beautifully.
Oatmeal type colours and softer off whites similar to Farrow and Ball's Clunch, Shaded White, Dimity and London Stone.
Or Little Greene's Mushroom, Limestone and Rolling Fog.
If you chose the paler shades, then for curtains you could go with a linen or cotton with a slight texture which could be a similar shade to the wall paper if it were a feature area.
If the wall paper is for the whole room, I'd look at curtains which were a shade or two darker than the wall paper to help them stand out. Perhaps like the furniture.
If it's the whole room, then I would paint all woodwork completely white. And an eggshell or satin finish. Gloss finish might fight with the wall paper texture.