Expanding on the ability to add frames to your prints through the undocumented use of the ID Plate, Mike Wong has expanded on the information I provided in my Frames video tutorial from the day before Lightroom was released. Scott Kelby mentions this in his Lightroom book also. Again cheers to Andreas Noren for discovering this useful workaround.
Being on the onOne team, Mike has access to a load of wonderful frames that he is providing free to use. Make sure you email him if you use them!
Update: Mike now mentions Andreas in his post! Cheers Mike!
Although, not frames quite like these, you can use Apparent Software’s Image Framer (Mac OS X only) to add framing in batch from Lightroom when exporting photos. It give some additional benefits, too.