Gradient Frame has no dependencies but comes with additional files that you can load. Place Gradient Frame.scm in your gimp scripts folder and refresh
Menu Location is Script-Fu/Edges/Gradient Frame
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WrapMap is a Python plugin for Gimp that wraps a user-defined border around a shape (determined by the selection). For instance, given this shape (obtained by a text-to-selection):
This script will render a mat and a beveled frame around an image.
Matting and framing are separate operations, with user selectable textures, patterns, colors and bevel settings. This is a versatile script with a plethora of configuration options for maximum flexibility.