I have also seen similar centerpieces that use epsom salts instead of sugar. You could also sprinkle a mix of pearls/gems. Sand (or sugar), faux pearls, a 3 candle. An easy DIY wedding centerpiece idea.
Tattoo and tattoo artists have always been fond of dark imagery in their work. Naturally, skulls are one of the most popular tattoos. One of the things that is so awesome about skull tattoos is that there are so many.