The Hive has this cool thing where on your profile it shows a 3D profile picture.
If you want to get the transparent background PNG, all you need to do is look a little bit into the code.
THIS MAY NOT WORK UNLESS THE PLAYER HAS JOINED THE HIVE.
I'm assuming that you have to have your skin on the Hive's database for this to work, but I'm not entirely sure.
The ip for the hive is: eu.hivemc.com or us.hivemc.com
It works with 1.8 skins, but I don't think it works with Alex skins.