I've forgotten how to do it otherwise I would have done it myself.
Here you go:
Here's a transparent version:
Depending on the program you use (I personally use Photoshop) you just have to use a combination of the magic wand/selection tools and the eraser to get rid of the white (blue in this case) parts and leave behind a transparent layer instead. Just make sure it's saved as a .png and it should save with the transparent background.