There's something to be said for simplicity, and I think you've got the right idea, but perhaps you could try adding some depth and get away from solid colors. I could see that power symbol looking like one of those gel/shiny graphics. I don't know exactly what they need, but get a little more adventuress with them. Perhaps the plant one could have pictures of a factory plant with roots coming out of the bottom of it faded into the background.
I like them. I think if you are going to use that font then you should make the letters not have the exact same grunge effect on them. I think it takes away from the effect when all of the same letters have the same distress marks.
Yep, I would pencil sketch the basic shape and then use a black fibre tip pen on top. Kerm's suggestion of scanning and live tracing the result is good too.
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