Cool illustration, it looks great and if I were the client I'd be happy with it. One question about the illustration gets at me though... Who's going to spend money filtering storm run off? (Idealistically it's good, but after a while cleaning out the thing and perhaps changing the filters would seem to be a bit $$$.) I think a more sensible location would be in an indoor drainage situation such as a warehouse, etc., where chemical spills are possible, etc. (But then again what do I know. The warehouse wouldn't be a bad start for an illustration - you could have an "oops" situation with a forklift driver and some barrels that have fallen off a pallet and started leaking.) Also if it's just a device to skim oil, it would be fairly low maintenance outdoors. However some chemicals such as antifreeze would pass through the thing since they are water soluble and don't separate readily. Just my 2.

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Barbequed Pixels?

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There might be something worth downloading.