Pachelbel's "Canon in D" is beautiful and always appropriate (unlike some other possibilities!), even though not the most original of pieces to walk down the aisle to at your wedding. Unless you play it yourself.
When Andrea and Jordan Strauss were married, they surprised their 150 guests with an electric-guitar rendition of the piece, playing it while they walked down the aisle. What's especially sweet is that Jordan is a full-time music teacher, and he taught Andrea how to play the guitar specifically for their wedding (she had no prior music training)! And the part that's especially impressive? She did it wearing a wedding gown, sporting fake nails, and walking in four-inch heels. And she doesn't seem to have any stage fright at all!
I think it's sweet! What do you think? Would you ever attempt anything like this?