I was going to say that if you want to stick to paper, you could go for a book(s), tickets, or a lovely framed photo. Otherwise you could give yourselfs a night or weekend away, a day spa or massage voucher if DH is into that, a lovely dinner out or something electronic - say an ipod nano if he doesn't have one (you can get them engraved if you order from the website) or something else that can be engraved.