I had the pleasure most recently, designing invitations for "Darby Fire Patrol's 100 Year Anniversary". Since, it was going to be a black tie affair - I thought it would be perfect to design the invitation all black incorporating the original old firehouse image. And use a few red elements. I then used silver metallic envelopes and finished off the envelopes with a red wax seal. There is something so special about getting an invitation in the mail with a wax seal. Today, doing wax seals on envelopes have completely changed. No more matches - just place the wax sticks in a glue gun and go. How great is that!
