The first thing you're going to need is a skin.xml file. Preferably you'll choose skin that's as much similar in colors as the one you have in mind and want to do. So if you're making a dark skin then you want get a dark skin XML file. If you're making a bright skin, well, get a skin that’s bright. The reason for this is that this way you might have fewer things that need a change. Also, you'll have the original colors' numbers (this will be explained later) as reference.
I didn't find the right solution from the Internet.
References: http://musicbee.wikia.com/wiki/Skinning_Guide
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