A few hours later, and this has emerged.

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The swirl is a series of OpenGL Triangles.
They're drawn in a very lazy way, but there's 2500 of them onscreen, and they're all nicely gradiented between 3 colours, and slowly being shrunk to nothing, whilst spinning around.

You can Download the test here for Windows.
Holding Spacebar (or Z or J or Enter) will show you what the Triangle looks like.. Fancy!!

Be sure to let me know if it runs on your system.

Tomorrow I'll be trying to get that to look the same on other systems, too!