Sorry, I give up 
I don’t understand how on earth this thing works 
Can someone please really explain in terms that a non-technical artist could understand ? (after spending entire evening on Showdown demo, it seems that not only Material setup is mind numbing, but also assets had to be prepared in a certain way; I couldn’t figure it out for **** )
Here is my setup:
Full size: http://s23.postimg.org/hhw7oi42h/blob_shadow01.png
Full size: http://s28.postimg.org/cymd8m50r/blob_shadow02.png
Full size: http://s9.postimg.org/6o4odt14d/blob_shadow03.png
So, at this time it doesn’t do anything at all - doesn’t offset texture to be a few units above the floor and I am sure if the critter would walk along, it wouldn’t project straight down either. Plus if I move the plane with blob shadow texture above the foot, it will also darken the foot.