So many, many things come to mind....

Leading the bride down the aisle on her hands and knees at the end of a chain, naked but for her collar and veil..
Replacing 'you may now kiss the bride' with 'you may now worship your Master's feet'..
Replace the bridal waltz with a celebratory spanking..
Wearing my leathers, rather than a suit...
Putting a literal meaning back behind 'love, honour and obey'...

Possibilities are endless, really.