This may be old news, but I thought I would share it anyway. Below is a link to an awesome site with several skins as well as new colormaps. I have tried several of the colormaps and I must say they are very nice work. The new one for the night mode is very nice. It makes the divice look like the terrian is lit by the moon. Very nice. Go have a look and try some of these. Instructions to install are posted on the right side of the page. Two thumbs up for this site!
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http://artwork-igo8.blogspot.com/