Scripts:
Bas_relief
Blue
Richmon
Bump
Watercolor
Paint
Charcoal
Isoline
Cut_out
Liquid
Source images:
Scripts by Alex Link
Blue
This script produces a lively blue monochrome from the current image. Ctrl-Z or a click on the undo icon will change it to a brown monochrome. Again remove masks and combine objects with background before running the script. You can use the (Ctrl-Shft-U) Hue Saturation and Lightness filter to fine tune the color to your taste.
Download the script here: blue.csc