I thought I'd try get the same (or close) bokeh I'm getting with my E-620 and 50-200mm from my HS-20. So, I put the Raynox DCR-150 on the HS-20 and went out and took a few.
I don't think these are QUITE the quality of the Oly/50-200mm combination but I don't think they are very far off. I'm going to try a little more experimenting.
I thought the next two came the closest to what I was looking for.