The twee-ness depends on how the squares are decorated. I had friends who did it, and fortunately their wedding was small enough and people had enough sense (and it was assembled by the bride's grandmother, if I'm not mistaken, who had taste coming out of her eyeballs) that the final product was lovely. I do agree that the concept itself is dangerously cutesy-poo prone, though.

Of course, that was something the couple decided to do, rather than something someone decided for them.

Note: there will be a great deal of "I am my beloved's, and my beloved is mine."