Kinda wanted to submit this for halloween, as Crane is a very creepy guy and I figured his attire is well suited for the occasion.
This idea was basically a what if scenario, if the infection from Left 4 Dead had crossed over into the world of Batman and hit Gotham City. While the origins of the infection in L4D are rather mysterious, I decided Scarecrow could possibly be the instigator of the virus in this scenario, infecting individuals with a powerful new chemical, spreading insanity, chaos and most of all - fear.
Although this is all just a random idea, I guess his new chemical strain would have severe effects on certain individuals, who in turn go through mutations like the Boomer, Witch, etc.
(If you right click and view image or download, should look slightly more higher res.)
Posed in GMod, edited via Photoshop.