If you want the look of a traditional wedding invitation, but would like to implement your wedding colors, consider using one of your colors as the lining color for the envelopes. This is a subtle and attractive way to customize the appearance of your invitations. Other places to add accent colors are on envelope seals, monograms and motifs. Careful use of color can add drama or whimsy to your invitations without adding much to the price.
There are some extra stationery things that are required when ordering invitations. RSVP cards are required if couples are having a sit down dinner. Couples need to know the guest count to figure out how much food to order. It is no longer tradition to pay for postage for guests to send the RSVP card back to the couple. Send invitations early to give guests plenty of notice about the wedding. They should be sent out at least two months before the wedding and no more than four months before. Make the RSVP date between four and six weeks before the wedding. This helps you know exactly how many guests will show up.