- Launch GIMP and create a new file by going to File -> New. You can use any image size. In this tutorial I use a 800x600 image.
- Click the Blend Tool on the Toolbox panel and set its mode to Difference, gradient to "Metallic Something" and shape to "Conical (sym)".
- With the Blend Tool selected, click and drag on the canvas area a couple times until you get the color gradient combination you want (5 - 8 times I think is enough).
- Create a new transparent layer by going to Layer -> New Layer. On the appearing pop-up dialog, select Transparency.
- With the new transparent layer selected, go Filters -> Render -> Clouds -> Solid Noise. On the appearing pop-up dialog, set the values of X and Y according to your image size. Since my image is 800x600, so I set the value of X to 8.0, while the value of Y is 6.0. Before clicking the OK button, check the Randomize option.
- Move the transparent layer down below the background layer.
- With the background layer selected, go to Filters -> Map -> Displace. A pop-up menu dialog will appear. Select the displacements from the dropdown menu button. Since you want to create a dripping paint effect, you need to set the X displacement value to 0. For the Y displacement value, you can set it to 50. Before clicking OK button, check the Smear option on the Edge Behavior section.
- Repeat the Displace filter a couple times until you get the dripping effect you want. You can press the CTRL+F button on your keyboard to do so.
- Once you get satisfied with the dripping effect, set the color balance by going to Color -> Color Balance. Adjust the color levels on the appearing pop-up dialog.
- Duplicate the background layer by going to Layer -> Duplicate Layer.
- With the duplicated layer selected, go Filters -> Blur -> Gaussian Blur. Set the Horizontal and Vertical values to 20.
- Change the mode of the duplicated layer to Screen and lower its opacity to about 60.
- Duplicate the duplicated layer. Leave the opacity to 60 and change the mode to Overlay.
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