Buy a gift that represents an interest.
For example, a wine lovers appreciate a special vintage bottle of wine as a food guru will like to have some cooking classes. Try to choose a gift that will cover both the bride and groom. Try to match their interests together, like music or theater. Get them tickets to a special event during the honeymoon.
Do something extraordinary to surprise the couple. Have a flag flown over the capital to celebrate the wedding of your friends. Offer them a special day at the spa or a night at a bed and breakfast.
Go to the big gift from the wedding registry. Since this can be quite expensive, you can ask some other friends to join you with this gift. Usually, the couple may include something in the registry that are very expensive but they would really like it, in the hope that someone can buy it.
Choose a dish or a picture frame from the registry, and engrave them. Personalize items with the wedding date and name of the couple. Buy them towels with their initials on.