If creating one would boost sales or promote positive implications to oneself, then by all means, go ahead and do what’s best.
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When designing website customization, always choose matching colors. An example of a matching color would be to have a dark background, with visible words and designs. With the dark theme, try not to mix too many bright colors into the design. What we should NEVER do, is to mix two very different colors, such as purple and yellow. Now, of course, it would depend on the purpose of the website, but those two colors are too striking for one who wants it to look more professional.