The following color filters group contains miscellaneous filters to modify colors in an image, a layer or a selection. You can find some nice effects here.
Section 8.33, “ Colorify ”
Section 8.34, “ Color to Alpha ”
Section 8.35, “ Filter Pack ”
Section 8.36, “ Hot ”
Section 8.37, “ Max RGB ”
Section 8.38, “ Retinex ”