This is a series of scripts that implement various layer effects:
Bevel and Emboss
Some effects can have contours (a.k.a. curves) and noise added to them. Effects can either be applied on a separate layer, or be merged into the active layer (which in some cases gives better results).
Amazing Circle technique with advanced options. Includes options to choose border colour (or calculate from border average), border size and vignetting effect, whirl/pinch distortion, alternate circle method, plus optional drop shadow & shading.
After you download the script to your scripts folder and refresh your scripts (Filters -> Script-Fu –> Refresh Scripts), you'll find the new script in the menu under Script-Fu> Darla –> Saturation Fix.