Script-Fu -> Palette Knife

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  This is a non-adjustable script which can render a palette knife texture to an image. It does, however, render onto a separate layer, so the results can be "toned-down" as needed. (See lower example)
  
  

Original Image
Detail from "the Lovers" by Pablo Picasso

result:
Default Settings

layer dialog:

to adjust results of palette-knife script

Since palette-knife creates a new layer and leaves it -- you can adjst the layer opacity to tone the effect down as needed. You can choose from the image menu: WINDOWS > DOCKABLE DIALOGS > LAYERS (or Ctrl + L) There you can set the layer opacity. In the example I drag the slider to 50% . . . the "palette Knife" layer was already selected.

result modified:

opacity set to 50%