If you are planning a romantic centerpiece, Six Sisters Stuff has a great tutorial on how to make these 'Love Blocks.' Depending on how you size them you can use them at each place setting or as part of a centerpiece. Combine with some votives in similar colors and you're ready to rock!
I love the variety of black and white backgrounds with the bright red accents, use them for a Valentine's Day wedding or any wedding that black, red and white accents will coordinate with. No doing those colors? Just change out the colors to some that work with your wedding theme colors.