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According to Wikipedia  https://en.wikipedia.org/wiki/Manukan_Island , Manukan Island is the second largest island in the Tunku Abdul Rahman National Park , Sabah . This is a Facebook 3DPhoto taken just after the sun has set and what a glorious colorful sunset it was. Click the image below to view.

The Cloud Gate sculpture (nicknamed as the Chicago Bean ) is located at Chicago's Millenium Park . It was a cold winter day when I took this photo with a Canon DSLR. Now I made it into a Facebook 3D photo by painting a grayscale disparity/depth map using Gimp 's brushes, selection tools, gradient fill and transparency masks. 

This photo was taken at Singapore's MacRitchie Reservoir at sunset using a Canon Powershot digital camera. The disparity/depth image (see the animated thumbnail) that gives the 3D parallax effect as seen in the embedded Facebook image was generated using Gimp 's gradient, brushes, selection and channel tools.

This grayscale disparity image/depth map for generating a Facebook 3DPhoto image of Claude Monet's Wheatstacks (End of Summer) 1890-1891  oil on canvas painting was created using the Krita Painting application.  The resultant 3DPhoto can be seen in the embedded iFrame below. More information about Monet's haystacks can be found on Wikipedia  https://en.wikipedia.org/wiki/Haystacks_(Monet_series) .   

This is Vincent van Gogh 's second version of The Bedroom in Arles (1889) rendered with in Facebook's 3DPhoto viewer. To enable the 3D parallax effect, Gimp was used to paint the disparity image or depth map in grayscale as can be seen in the black and white thumbnail on the left.  For more information about the van Gogh's painting can be found in Wikipedia  https://en.wikipedia.org/wiki/Bedroom_in_Arles   

From Wikipedia ( https://en.wikipedia.org/wiki/A_Sunday_Afternoon_on_the_Island_of_La_Grande_Jatte ): A Sunday Afternoon on the Island of La Grande Jatte (French: Un dimanche après-midi à l'Île de la Grande Jatte ) painted in 1884, is Georges Seurat 's most famous work. It is a leading example of pointillist technique, executed on a large canvas. Seurat's composition includes a number of Parisians at a park on the banks of the River Seine. I thought it would be cool to paint a disparity/depth map with Gimp to convert Georges' painting to a so-called Facebook 3DPhoto ; and the result is shown embedded below.

Like other image editing software such as Gimp or Photoshop , Krita has similar tools to remove the background of an image non-destructively using transparency masks. The following steps show how: Open up an image in Krita . In the Layers pane on the right, mouse right click on the paint layer. A pop up menu appears . Choose Add | Transparency Mask . A transparency mask sub layer is created underneath the paint layer . Draw a selection polygon roughly around the foreground object in the image using the Polygonal Selection Tool , as shown below. Then in the File menu, click Select | Invert Selection . Choose Black as the foreground color. Choose a Brush e.g. Basic-1 Ink . Make sure the transparency mask layer is selected or active. Then paint over the background. Choose Select | Deselect to remove the selection polygon. The marching ants selection polygon is removed . Make the brush size smaller and zoom closer  to the background - foreground boundary. Brush over t...

I made this free colorful abstract geometrical background and published it on the OpenClipart site. Click here  https://openclipart.org/detail/318138/abstract-colorful-geometric-background  to download.

The usual way to color line art drawings in digital image manipulation software is to use a Color Fill tool to fill an area bounded by line work. Krita has a useful tool called the Colorize Mask Editing Tool which allows you to simply draw a patch inside the line work with the color you want to fill. Once all the color patches have been drawn, you could preview the color fill and if everything is to your satisfaction, you can just click a button to save the color fill permanently. The following steps illustrate: Start Krita . Open up a line work drawing e.g. christmas_tree.svg . Then in the main tool bar, click the Colorize Mask Editing Tool , as highlighted in a red circle in the screenshot above. Then click on the drawing. The line work becomes transparent . A new Colorize Mask layer is created . If a brush is not selected, then choose a brush e.g. Basic-1 . Adjust the brush size if necessary. Then use the Advanced Color Selector pane to choose the desired color for the ...