This is a modification of Antifarea / CharlesGabriel's great OGA monsters entry that lets you do dynamic lighting on the 2D sprites when used in combination with a shader.  I've included an example render along with the 2D normal map.  

Original Entry:  http://opengameart.org/content/10-more-fantasy-rpg-enemies-plus-a-boss#

I created the normal map using the beta version of Sprite DLight (I'm one of the Kickstarter backers).  It was Greenlit on Steam if anyone's interested in it.  (note: I have no affiliation with Sprite DLight other than being a pleased Kickstarter backer).

http://steamcommunity.com/sharedfiles/filedetails/?id=340326626