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. The script is very time consuming, especially with larger images, and if you've toggled to use a layer with the Lava script-fu effect.
Not very good for photos or photorealistic stuff; looks best with an input of large areas of uniform color and text on a white background.
If anyone hits on any bugs, sending an e-mail to firstname.lastname@example.org would be appreciated.
Yes, the code is ugly. I am not a programmer.
Attached is an example image with a transition from Before to After.