Hey, sorry if this has been asked before, but I am finding it hard to describe what I want, so searching was difficult.

Is there any .psd files of the original icons that I can use to edit them easy? For example, the Mail icon has an envelope on it with a blue background. Is there a file that is split into two parts, with the envelope and the background on separate layers?

Its hard to word what I am asking for. I'm essentially trying to find the easiest way to change the colours of the original icons.

Thanks