I think it’s time for a new icon for iTerm2 – I’ve changed mine based on the picture at on the iTerm2 website – but mine are very unimaginative, but here they are if you want  Click on the pictures below if you want your own copies.  Then go to your Applications folder, find iTerm.app, hit ⌘-i and then drag the icon file from where you saved it over to the icon picture you see in the Get Info window you see at the top left hand corner.  Hopefully someone will be creative enough to do something better.