Here are some scripts from my scripts directory, which happened to be fixed for 2.7, either because I needed them or out of curiosity. They may be backward incompatible with 2.6. If I did the work before the authors, they can receive their good back here. The scripts are:
histogram_match.scm
shadow-highlight.scm
elsamuko-grain.scm
CarTOONize_2.scm
film-like-grain.scm
hdroberts-cmy-adjust.scm
color-booster.scm
elsamuko-erosion-sharpen.scm read more »
This plug-in creates a toy effect or tilt-shift miniature faking on a selected layer

Before
Demo picture: "Marina Duisburg am Innenhafen" - G. Sawatzky - Wikipedia.de

After

The GUI read more »
This is a little simple script what helphs to hatching selected area of picture with a pencil-like lines (random noise+moving blur). This script is used in "yet another way" to stylize photo like a drawing. Examples are here,
full description is at http://leoblog.ru/?Proekty:Pesni_pro_grafiku:Make_a_picture_from_photo_%...


video example
This Plug-in for Gimp will let you put a scanned CD photo into a 'virtual' case.
To use it, install the plug-in, open the CD image with Gimp and then go to Filters -> Artistic -> CD Casefier…
This is a modified version of the script at http://registry.gimp.org/node/22018 which allows you to run it from the command line, automatically merging the layers and saving to the same filename. I also created a simple batch wrapper around this, based on the code at http://www.gimp.org/tutorials/Basic_Batch/ and sliced and diced it appropriately.

[Taken from the original script page, hope they don't mind!] read more »
OK - so I saw this plugin today:
Cross Processing (Xpro) http://registry.gimp.org/node/25007
Which is based on this excellent tutorial by jEsuSdA: http://www.jesusda.com/blog/index.php?id=375
After running through the tutorial, I decided to write another version of the plug-in with a few options.
This plug-in requires Python. If you have the 'Filters->Python-Fu->Console' menu item you are all set. If not, install Python support for GIMP.
The plugin can be found under Filters>Artistic>Cross-Process. Don't forget to make the plugin executable.
Options: read more »
New version (probably the last): add "work on copy" option. (gimp_pile_photo_woc.zip)
New version with random Hue Lightness and Saturation. (gimp_pile_photo_hls.zip)
This plug-in allows you to split an image into many small overlapping images.
Filters-->Decor-->Pile's Photos
This plugin is creating a number frames around a selection with increasing opacity. Rectangle, ellipse and diamond possible. Example see http://www.gimp-atelier.org/forum/viewtopic.php?f=69&t=358
You will find this script on GIMP at Filters / Gimp-Atelier/Darken Frames ++ or if you are working with menu with reduced size (height 755 pixel) at Filters / Gimp-Atelier/Darken Frames
English version: darkenframes_en.zip
Reduced Menu: darkenframeswin_en.zip
Documentation: http://www.gimp-atelier.org/forum/viewtopic.php?p=2251#p2251 read more »
A python conversion of my script-fu Line border script (http://registry.gimp.org/node/118). This version uses python-glade dialogs. It allows to create smaller and much clever input dialog and integrate much more functions. On other side, due to missing support of glade dialogs from Gimp, there is not possble to run this script in batch mode.
Current features: read more »
This plug-in changes color balance to imitate images taken with Manual / Classic lenses but without any effect of degradation similar to images made with toy lenses.
See samples:
Original:

After Manual Lens filter:

Version 0.1.2:
Introduces Linux support.
Copy the .scm file to:
| Windows Vista/7 | C:\Users\[USER]\.gimp-2.6\scripts |
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