This will vary a bit depending on whether parents are issuing the invitation or whether the couple are doing so but in general this style is acceptable:
Making the right choice _ There is also no "right" choice when designing your wedding invitation. There is no one color that will look acceptable. Many people choose colors from their wedding theme to help coordinate the look of their wedding, but that is not necessary. It is more important that you choose a look that you love. The wedding invitation is a lifelong keepsake of your special day.