Here are 4 that have varied forms of DOF

http://www.renderosity.com/mod/gallery/index.php?image_id=1422731&member

http://www.renderosity.com/mod/gallery/index.php?image_id=1413381&member

http://www.renderosity.com/mod/gallery/index.php?image_id=1399483&member

http://www.renderosity.com/mod/gallery/index.php?image_id=1373649&member

In the near future I'm going to check out the DOF Gen Pro.

2 points I have using DOF in Bryce is that the level of control is less than detailed manipulation
and I get impatient waiting, and if there's something I want to change...have to Re-render.

I'm presently Running a Multi focus object scene, 79% done. Will post a final and the Wire with settings.

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Ockham's razor- It's that simple