DIY: You can make a Haunted Mansion Halloween Party invitation from any logo found online. All you need is photoshop, a printer, heavy paper stock and perhaps the Ravenscroft font..found on this pin board.
I've done this one for a friend's party. BIG hit. I suggest reaching out to other ideas, too. I've done the brain, but also human heart. Be careful with the fondant. Thin as possible. I just used shortening and flour or something, and it tasted like crap.