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G'Day Lee,
It looks quite effective doesn't it.
I have a copy of David Malin's "A Celebration of Colour in Astronomy". The first two images are "similar but different"... They are images of the Orion and then Crux and the Pointers as you have done, but what David did was start off in focus, and periodically tweak the focus out a little bit more each time as the stars trailed. It looks quite effective, and gives a good indication of both colour and brightness. No doubt it takes a little bit of practice to get the timing / focus tweak right so it looks like a uniform progression!
To illustrate I've done a quick scan of the crux image - please note this image is copyright David Malin. I have only posted it here to demonstrate the technique - and please note the scan does not do the image justice! The original print is superb!
Al.
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