This is what happens when I have a few minutes to kill. I really don’t know what I was going for by doing this but for pure amusement. Anyway, above is a collection of six randomly designed logos in gray scale. The drawing to the left of every image is just a quick graphite gradient style sketch that would represent the wording.
My favorite would have to be “fire dropplet.” I find that the shading on it was done pretty well.