Re: wait, wat agin
got a few c4d renders, put them on the sig at either Lighten or Screen, dragged it around in the sig to see which part looked good and erased parts that didn't (that left part is a poopload of layers). the renders were completely yellow so I had to ctrl-u every second.
and yo, for a tight effect, go:
get your sig and put a render on there or w/e, put it on screen
duplicate the render and put it on color dodge
gaussian blur 3.0 it
ctrl-u and mess around with the hue to see what looks best.