brown, it makes the couch pop. hope this helped! good luck! :)
tan or other browns, or mayyybe dark green, depending the actual shade of the sofa. or lighter green. Avoid scarlet reds and yellows. ew.
we have a mint green- and white sofa. It depends on if the sofa is more traditional looking, or modern. If traditional, then definitely a brown (tannish colour) If it's more modern, try white. We have mint green chairs to match and a bunch of white and silver tables, and white walls