This clip shows how to change window skins in MMiX.Me (a 3D music player for Windows). The ability to change skin was added in 0.2.2. You can also see the spectrum analyser in the background and three collections (local music, web browser pages and Internet streaming stations).
If you have any problems with the app, don't just dis it, instead please let me know, so I have a chance to fix it! : D