Pyrochild wrote a marvelous Gradient Mapping plugin. However, its possibilities are uncovered not completely.
I found some gradients at our Forums.
Note: gradients for old version of a plugin (like MiguelPereira's Gradients) are incompatible with the new version and can lead to crash paint.net.
Gradients.zip by MiguelPereira for new version Gradient Mapping. Contains 4 gradients: Lemony, Rainbow, Weird, and Weird2.
Sarkut's Yellow Gold gives golden color to elements of your image.
ThermalImage by natjo1986. It fades from purple to red or fading from cold then to hot.
Pop_Art_Hope colors the image in PopArt style.
Pratyush's Metallic Presets contains 16 different gradients of shades of metal.
Pratyush's Sky Presets contains 23 different gradients type of sky.
I made some presets to stimulate usage of Gradient Mapping. Note: put in a folder Gradient Mapping only gradients necessary for you. At a large number of gradients, you can not see them all in the drop-down list of gradients.
Black and White.zip contrast gradient for tutorials.
Bokeh.zip contains 11 different gradients which allow to paint parts of the image in color inherent Bokeh effect.
Chocolate.zip contains 9 different gradients of chocolate color.
Colors.zip contains 9 different multi-colored gradients.
Fire.zip contains 12 different fire gradients.
Fruity.zip contains 13 different gradients with fruit undertones.
Gels.zip contains 25 different gels gradients. NEW!
Golden.zip contains 9 different gradients of golden color.
GreensAndBlues.zip contains 12 different gradients in green and blue tones. NEW!
Harmony.zip contains 7 different multicolor gradients.
Metalls.zip contains 5 different gradients of shades of metal.
Neon.zip contains 10 different gradients like a neon glow.
Pastel.zip contains 8 different gradients (an analogue of the Photoshops gradient set Pastel). NEW!
Pop_Art.zip contains 15 different presets for creation of portraits in Pop Art style.
Rainbow.zip contains 9 different gradients in rainbow tones.
Silvery.zip contains 10 different presets with silver shades.
Simples.zip contains 14 different two-color gradients.
Spectrum.zip contains 5 different four-colored gradients.
Vintage.zip contains 10 different preset for changing the image like a vintage photo.
I hope to see your work with presets for Gradient Mapping.
Open for itself the wonderful world of colors!
To be continued...