Step 1: First of all Choose your Favourite Skin from the Official Site Here and Download it to your Computer(Remember the Path).

Here in the Below Picture i Gave my VLC a new Look of Winamp Media player. This looks Cool.

Step 2: Open VLC media Player.

Step 3: Press CTRL + P to Open Preferences Window or You can also click on Tools > Preferences.

Step 4: Now Click on Use Custom Skin, Now you will be asked to Choose the path, So click on Choose and navigate tot he theme file you saved earlier Which is usually Downloads Folder.

Step 5: After Choosing the File, its time to Click on Save. Thats it. Now Close VLC and Open it again to have a whole new look to it.

There are Plenty of Themes available on the official site already and this feature is not much known to users but users who know this loves it.

I hope you will enjoy this VLC trick. Don't forget to share it with your friends as well.