Classical Photo Frame + Quickmask

The classical frame can be combined with other effects e.g. the simple quickmask applications given by Zach Beane at the GIMP's site. Note that in this case, you have to only deal with a single layer ("layer4" in this post).

Steps

• On the layer, create a rectangular selection then press the quickmask button
• Apply [Filters]-->[Distorts]-->[Waves] then [Filters]-->[Blur]-->[Gaussian Blur]
• Uncheck quickmask; [Select]-->[Invert Selection] and finally [Edit]-->[Clear]
  

You may also use [Filters]-->[Noise]-->[Spread] to get a different effect. Note that if you read the above mentioned Zach's tutorial, my experiments using GIMP 2.4.6 on Windows platform, the filters [Distorts]-->[Newsprint] and [Blur]-->[Pixelize] can not be applied to quickmask (??).

Credits
gimp.org | Zach Beane (xach-at-gimp.org)

Note GIMP 2.4.6