With this script you can generate a effect with your text layer that looks like the effect of the text on the trademark of the 20th Century Fox movie company.
It is based on the Bump project script that is already in the standard GIMP. When started, it will generate the effect searching the center of the image.
You can adapt
the number of layers, it will make the tail behind the chracters longer,
the horizontal and vertical shrink per layer, it will determine the speed of shrinking
the horizontal and vertical move of the center per layer, it will bow the tail
and the bump map parameters.
It will create a new layer, behind the text-layer, that will contain the effect.
You need a lot of layers. Slow computers will take long time.