These two scripts make Sierpinksi fractals. One does a triangle, and one does a carpet. The attached pictures show what happens when the scripts are run with the default values. You can change the sizes and colors, as wel as making the "holes" in each of the shape transparent.
These two scripts are both found in the Filters -> SambrookJM -> Sierpinksi. No, they're not overly useful scripts, but someone out there may find a use for them.
Highpass sharpening script (this is my first script for Gimp).
This technique is described by Rolf Steinort in episode 164 of the Meet the Gimp! video podcast.
You can run it from: Filters -> SkYNeT -> Enhance -> High Pass Sharpening
Because script makes a new layer from visible, make sure you have visible only layer you wish to sharpen. Other layers must be non visible.
Applies the currently open image to a batch of images as a dark frame, for the removal of hot-pixels in sequences of images. Suitable for timelapse or other animations taken in low light with non-RAW images where dark frames typically cannot be applied on opening.
Can act on all images in a directory, on a range of images between two specified (default) or on a single image. Output files have a specified prefix, a sequentially numeric suffix (eg Frame00001.jpg) from a specified starting number. The output directory may be specified, or the input directory used.
A revised version of my first script I wrote in 2009 during a boring weekend, this script takes an image as input, duplicates and flattens it, and then applies several plugin and script-fu effects on a dozen different layers to create a paper or parchment-like effect on the cheap, with the final output an image with layers and some layer masks. An optimal input image is a 1000x1000 square image (maybe I'll update the script to fix that "square" part; the problem is a round blend, but it's not that hard to fix after-wards), but it scales more or less.