A good friend of mine is getting married, and I want to get her and her soon-to-be husband a great gift.  I have already purchased something from their registry, but I didn't want the only thing I get them to be something practical.  I would love to get them something more special and something they aren't expecting in addition to the registry item I got them.  I'm setting my budget at around $20-30 for this part of their gift, but I'm having trouble thinking of something.  For married couples out there, was there anything you didn't put on your registry that you wished you had?  Or were there any really special/unique gifts that you received that you really loved?  I have a few gift ideas that would be great for just my friend (the bride), but I would really like to find something for both of them.  Any ideas?