For quick access, many Chrome extensions have icons in the navigation bar. The problem is sometimes they can be pretty ugly. Here's how to change them to something more your liking.Reader tombotek discovers where those icons are stored:
I'm not big on extensions, if I were, I would have switched to Firefox, but there are a few extensions that I need and use. One thing that I don't like about extensions is their icons, I think they can sometimes take away Chrome's clean, streamline design.
So I looked for icons (I used www.iconfinder.com) and changed the icon for the button that appears in Chrome's extensions bar.
In Windows 7, the extensions folder is located in: C:\Users\USER NAME\AppData\Local\Google\Chrome\ Data\Default\Extensions.
On a Mac, the extensions folder is in
From the extensions folder, you'll see a few folders which are just gibberish. Double-click on one, double click on the next folder that shows up (with a version number in it), then head to the images folder. From there, you should be able to tell what extension it is by the icon_128.png file.
Find an extension whose icon you want to change, and swap out the icon_19.png file with the icon you found online. When you restart Chrome, your new icon should show up in its place. Note that you'll probably have to redo this whenever the extension updates, so keep those icon files on hand for quick swap-outs. In the above image, I've replaced the previously mentioned Chrome Toolbox icon with this icon from Iconfinder.