Of course this is really easy to do on a Mac on your own. Just copy the icon out of the information box for the program. Paste it into the Image editor of your choice (i.e. photoshop et. al.) and change the color as desired. Then select the program and choose "Get Info" again. Select the program icon (this needs to be the icon at the top of the get info window not the preview) and paste in your revised icon.
If you already have the icon in the dock drag it out into a puff of smoke and then select the program with the new updated icon and drag it back to the dock. You will then have a custom colored icon for the latest version of AC. Also any subsequent copies opened will also use the new updated icon.
This works a treat and takes less time to do than to describe.
All this said, GS should really change the icon with a version change. At the very least change the color folks!
HTH
Erich
AC 19 6006 & AC 20
Mac OS 10.11.5
15" Retina MacBook Pro 2.6
27" iMac Retina 5K