It is very easy to change theme in Sk8r. Just follow these simple steps
First, you must use Sk8r (Monaco) and open the monaco folder and find monaco.html
Second, open Monaco.html with notepad or text editors.
Then search this simple variable I made:
var mainBack = "url(yoururlhere)"
var verticalBack = "url(yoururlhere)"
And put your url inside what says yoururlhere, it must be a jpg or gif or png.
Please comment your sk8r theme below.
Here is my example sk8r theme.