I found a cool site that can help couple save for a down payment or a special home project - it is a perfect gift registry, but not a traditional types:
 

Anytime you have events, weddings and more - you can register to have people help with special home improvement projects or contribute towards a down payment for a house!!!  The site is set up beautifully and your guests can make contributions starting at as little as $10 each!  It all adds up, too and it is way better than some of the gifts you can have trouble returning (I got three bird feeders once - I like birds, but it was overkill).