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Beige, light pink, light blue are fine. Just match the decoration style of your room. Light colors will do.
In fact, it is good that your sofa does not come with a sofa cover, if you want to match the sofa cover, you can match a beige sofa cover, which can match the color of the sofa and the background wall.
It is recommended that the pink color can be a flower pattern, or a simple style gauze curtain with transparent small details >>>More
Warm colors such as red and yellow coffee are beautiful.
It's really not easy to match, you can directly use white curtains, this is a universal color, you are a gray sofa, it is recommended to use light-colored curtains to match a little bit, because with dark curtains, the contrast is too great, so it looks uncomfortable.