Halloween decoration for tank?

[mattstanks2016]

Hey everyone!
It's getting close to Halloween and I was thinking why not add some decoration to the tank. I have a 75 reef rank filled with live rock so I don't know how I could put anything in there but any ideas to what I could do to the outside? If you have any crazy Halloween tanks why don't you post some photos!
Here's my tank

 

[Daniel@R2R]

I know reefers in previous years have decorated their tanks for Halloween, and I've seen quite a few reef themed jack-o-lanterns too. :-)