I want to create an overbloom effect on an object by manipulating its materials.  It's not really specularity though as the item in question is not lit and instead has ambient light.  What I'm trying to simulate is the illumination of many tiny lights on the outside of a large ship.  Setting the ambient color and value will ensure each light is visible in the dark, but it's rather dead looking, hence the desire to have a glow or overblooming.

Any ideas?