I just read this interesting post about a project for an SWT version based on Qt. The project argues it is for styling purposes. What is interesting is the Lotus platform (Lotus Expeditor) which is what Lotus Notes 8.x is based on has had SWidgets since day one. We even tried to get SWidgets put back into the Eclipse platform but with no success. You can play with the Lotus Expeditor platform and the toolkit for free.
If you are not familiar with Lotus Notes or Lotus Expeditor you can check out the UI – which is all based on Eclipse/SWT over at the Lotus Notes site.
Here is a screen shot of the Notes email system with styled SWT widgets: