Coming Soon.
Slate is a new Open Source Skin Template designed to make osu! skinning easy.
The skin is currently in beta and only supports Photoshop.
By default, Slate has a prebuilt skin on the Source Files, but it can easily be replaced, most of the important files on the project, such as the Song Select, contain a Master Template that can be used to change the entire interface by editing just a single file.
Download.
Slate is currently in a development state, where some stuff doesn't work as expected, or doesn't work at all! However, if you're willing to work with these limitations, and also maybe help towards the development of this project, you can go to the GitHub Repository for the skin.