I have taupe walls with a red accent wall. What color curtains would go with this?
This calls for a pastel effect, or the room will look too dark. I would go with Ecru, or pastel yellow.
White in the center, and red pulled to the sides, to match the couch
Depends on the room and how you want the room to feel. You could either go with a white sheer to lighten the room and make it feel more airy, or as mentioned above you could choose a pastel. If you want more of a rich feel I'd go with a heavier fabric in a stripe or gold... I'm not sure how much of a red wall you have. If your walls and curtains are really bright you will want to really minimalize the red you put in the decor. Just a few red pillows and some red flowers, then add gold or black pillows or chairs or another color to help even it all out.