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Use the pen tool to trace the area of an image that you want to select. When you're done, use the command "Ctrl+Alt+Enter", and it will select the image.
Then you can use your paint tool to paint the area. Or if you want to just fill out the area with a color, just set the color in either your BG/FG, then use the command "Ctrl+Backspace" for BG color and "Alt+Backspace" for FG color.