I still make Winamp skins - maybe you'd like to make some too?
It's a bit sparse here at the moment, but I'll be adding some of my personal skinning tools, instructional information, and links to other helpful resources here.

This skin was made to provide thorough documentation and templates for making Classic skins. Download and extract it to see the extensive README, as well as the helpful notes made on various template pieces.

The Gamma Editor is something I made recently to configure gamma groups (color themes) in Modern skins. Add your skin's images and XML assets, then adjust colors and output gamma group markup for your skin. It may still have room for improvement and feedback is welcome via email or github.