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A couple come to mind from many years ago:
When doing a hands shot to show off the rings, remember to place the bride's hand on top of the groom's, covering his fingernails. Guys aren't as careful about attention to detail here.
If there are several bride's maids, use their bouquets to frame the individual bride's maid's faces.
Years ago there was a famous photographer by the name of Bill Stockwell, who was known for his wedding photography. One of his trademark shots was something he called a "Misty" which was achieved by spraying a clear (or UV) filter with one of the small glass clearer atomizers to create a diffusion effect. Another trick he employed was to affix a piece of aluminum window screen in fromt of the lens. If you shot at a wide-open aperture, any catchlights would have a four-pointed star, even the catchlight in the bride's eye.
Lastly, if the wedding is in a church with lots of marble. Bill would photograph the marble patters and sandwich them in some of the formal portraits for an interesting look. This can be more easily done today in the digital arena. Good luck with the wedding! Let us know how it turns out.