Halloween is right around the corner and these fun gargoyle head magnetic decorations from Alternative Reef are the perfect addition to spook up your tank.
These were on display at ReefAPalooza but there are still some available that Scott was selling for $55.00 and $10 shipping on this forum. They all featured a variety of hand-built designs of various gargoyles, monsters and aliens. Each attach to your tank with a magnet and are rated for tanks up to 3/8 in. thick.
These would be perfect to get a spotlight or accent LED to highlight in your tank. Could also be cool to find a a plating coral to take over and make it a living design.