Looking for a template for custom start icons

Hi, I've been using Start11v2, and enjoying it. I wanted to make a custom start button, and borrowed one of the included ones to try and mimic it. I've somewhat done it, but it seems there is some spacing differences, and I am guessing this is due to spacing and resolution.

Is there a standard template that I can use for small icons, so I know exactly the scale it's looking for and the spacing between the three types of images?

Thanks!