[cheebacheeba]

I reckon Freddys claws "coming thru" the tower, and the silhouette of the hand and arm "behind" it, so I guess a solid background might make it more effective.

If, and probably only IF you were into transformers, you could kinda rework the deceptecon logo, make it a little longer than the original to cover more space, do it on top of a black (or if you could paint good enough, night sky) backing and draw some purple lightning through it...Not that it's horror, but I think it's pretty cool...

As for horror, I'm drawing a blank....cep't maybe for one bit. If you wanted to, you could design it so it looked like it had blood (just make sure it aint ketchup looking shit) dripping over the top, I guess you could put that over whatever pic you choose...

I'm out...