This IFS plugin does exactly what it says - applies an iterated function system over an image, finitely, making it fractal-like. Since images are worth a thousand words:
The above image was created from this one:
Then, by navigating to Filters, Misc, IFS, we get the following dialog:
Increasing the number of iterations, while taking more processing time, does make images pretty close to real fractals, and we still see small Wilber's when zooming in:
I had originally planned many more features for the plug-in (such as a preview and more IFS's to choose from), but honestly I grew bored of programming it, so there it is. There are probably a few bugs (notably, the target size is always an estimation and is sometimes plainly incorrect, for example when used with the Pythagoras Tree IFS), and there are a few console warnings I couldn't get rid of. However, it is still very much usable.
Included as attachments:
Thanks for reading! :)