A few questions about your wedding in order to get a better idea of style for Save the Date card:
-color scheme
-chosen venue
-do you live in a warm or cold area
-are you planning on fireworks at the wedding, is that why they were in your moc-up

The venue is Pier 5 Hotel in Baltimore, overlooking the inner harbor where fireworks are held at midnight to celebrate the new year. color scheme hasn't really been decided yet.