It's a little more complicated than you may think. Follow these points to the letter, and in this order:
1. Google and download an Origin transparent logo image, png, 256x256 will do,
2. Modify...

'Origin', like many other programs, has their own tile, or a manifest pointing to a certain tile color scheme.
You'd have to edit the manifest and provide your own image; Cliff S would be the one to...