Two summers ago, we went to Europe together. It was awesome. It felt rather honey-moonish, traveling and exploring, with only eachother to rely on in foreign countries. We've looked at Groupons and Living Social deals for international travel, and always stopped ourselves from going through with it because we said that we wouldn't do another trip until we were married.
I thought it would be cool to play off of that, by asking if she'd join me for a long term adventure :) Other trips can fall into place of course, but I think asking Christine to be my wife could certainly qualify as one.
Check out the pics below for a general process of the box being printed, painted, and padded: