I kind of think that something is missing in the conversation here... this is not a dig or anything but there are fast ways to do this stuff :) no offence at all here, just wondering what you guys are talking about? You get the full png files with both TE templates, it all depends on your image software on how far you can use the data...
About changing button colors... if you are trying to use fill and select to change the color there is a faster way.
You want to use "Hue and contrast" for most buttons and if the button or image is grey scale you use the color options. (There are other options as well but this is a good place to start.)
To darken and lighten you want to use brightness feature but when you use the slider on the + lighter side of the scale you need to counter with some contrast or your image will be washed out...
Once you have one button in a group the way you want it, make sure that you write down the RGB,HLS,HUE, contrast and so on... to repeat on all images... it will go fast then when you plug in the numbers... one other thing... depending on the starting color of the image you are working on the numbers will not be the same each time. like the orange in Tungsten... I turned them all blue in like an hour... I just dragged the slider on the hue to the blue... happened to be 100% full +/right.
But other colors would not be blue at 100% + right.
If you want to get fancy.... we can talk.... ;)
Peace!