Everybody wants their blog to be unique. Because of that K2 allows for a kind of sub-theme called ‘styles’. Simply put a style is a stylesheet file, optionally with any needed images, which can be selected in the K2 options panel.
You can distribute your own styles for other K2 users of course, and K2 will automagically show the relevant info about your style—giving you credit—in the footer of the blog using it.
via About « K2.
