I had created this originally for my own benefit, but I decided I'd share it instead, you may arrange buttons on it however you please. This was stretched a bit so it could all fit, so unless you have a 2048xXXXX screen resolution, it will look better in-game. Also, the white background is actually transparency.
I've finished a Terran and a Zerg variant. Check them out as well. All comments are welcome. ^.^
Recommended: Set the height higher. I got nice results setting it at 300. It makes it look less squished and nicer. It all really depends on your screen resolution.
I got nice results on my 1366x768 with height: 300 Width: 389
With those I could fit 5x3 bartender icons on them and they fit perfectly. (with some size changes I think)