I think I got it… I may still try again, but this one’s close.
There could be a bit more separation between the stream and the arm behind it, and I could probably stand to minimize the bokeh balls that sort of distract from the stream at the bottom, but this is pretty close to what I was looking for, so GoGo Me.
D7000. Vivitar 70-210mm f/3.5 Series 1 (Kiron, maybe), in Macro Mode. ISO100, 1/200th (AP mode), f/3.5. About 5 minutes of slider play in Aperture (plus a strange hang on the computer from an unknown cause that I’ll investigate shortly) to get something really pretty and artistic going.