I'm actually super happy with how this turned out because I was able to use a PSD I created (I modified it a little for this cover though to better suit the PNGs & background). It's called Chills & is available on my deviantart if anyone wants it :-)
Better quality: http://i.imgur.com/jlJN4SX.png
Gif of the cover being made (it looks so simple but I did a lot of little touch-ups I kept forgetting to add in; I didn't bother doing each layer individually otherwise this would be like 2 minutes long):