Her dad had passed away so she put tiny picture charms of her father on her shoes so he could literally walk her down the aisle. This melts my heart, I love this idea although my dad hasn't passed away.
On bday, dad gives a half heart necklace and kept half of it. Her half is attached to her bouquet on her wedding day. At the reception, dad surprises couple by giving his half to the groom. He passes down the responsibility of holding on to her heart.