Add them to the top of your cake, or use the cake picks to spell out whole names or messages on the side of your cake, the ribbon letters can be added to your bouquets.
So really there isn't anything you can't bling out!
DIY ALERT - These would be particular good, if you making your own cake, or your on a budget, would make the cake stand out, not to mention sparkle. Consider buying a plain iced cake, using ribbon (matching your colour scheme of course) and spelling both your names out on the side.
all images from Diane Bradley, Designer @ bling cake toppers