In each color box present in Twilight, you can paste hex color codes. These codes are a handy way to copy colors from one graphic application to another. They can be pasted in the color channel, reflection channel, background /sky color, sunlight color, and in the artificial light color box. As an example of their usefulness, if you're preparing a brochure, you can easily make the background color in your render match the background color you're using in your brochure design by just copy/pasting the hex code.
If you want to copy any color you see on your screen to Twilight, you can use a free application called The Color Picker:
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You just have to click on the eyedropper icon, and start clicking on all the colors you want from the screen. When you're finished picking colors, click the "Stop picking color" button and the colors you picked will appear in the "Color Palette". Select each one to make its hex code visible, and copy/paste this code to Twilight.
The "Color Palette Generator" you linked to in SCF is really cool, too! Extremely useful when you simply can't figure out what colors to use to capture a general mood. And it also generates hex codes you can copy and paste to Twilight: http://www.degraeve.com/color-palette/
