Some basic c4d guidelines-
Two types, effect and render. Effect c4d are usually set to either screen, lighten, or linear dodge, then they are erased in parts. Render c4d can be used as your main focal or can serve to greatly compliment a render/sprite ect in your signature. These are usually on a normal blending mode and lightly smudged in places to blend.
Effect c4d should not be overused and be your only way of gaining effects in a signature(my opinion).