I uploaded part 2 http://www.youtube.com/watch?v=ZoMMZeT8frM of my GIMP Script-Fu tutorial series on Saturday.
This part actually shows how to write a script (whereas part 1 http://www.youtube.com/watch?v=dAuJJ6P8Jxs was mostly an introduction to scheme). In fact, the script that I demonstrate how to make is the "Smooth Threshold" script from my recently released http://monsoonami.deviantart.com/art/Splatter-Brush-Generator-GIMP-Script-308796378 Splatter Brush Generator.
Look for part 3 in about a week or two.
I uploaded the first part of my GIMP scripting tutorial series today http://www.youtube.com/watch?v=dAuJJ6P8Jxs
Hopefully the second part will be up by next weekend.
The goal of this tutorial series will be to show how to make this Splatter Brush generating script http://monsoonami.deviantart.com/art/Splatter-Brush-Generator-GIMP-Script-308796378
I'm planning to upload video tutorials to YouTube more often this summer.
Here are 2 from the past 2 weeks:
Overview of GIMP 2.8 http://www.youtube.com/watch?v=lF2Xh-7vk4k
3D Spherical Text Effect http://www.youtube.com/watch?v=Z9FZJy3LdzE
Sorry, I'm a little too busy with other stuff, but you could try asking around on some GIMP forums to see if anyone would be willing to make one for you, or show you how to make it yourself.