Is there any way to just change the icon in the dock while still keeping it the same everywhere else? It's probably not going to be possible without tweaks, so are there any programs for that?
A workaround is to make an alias of the app, drag the alias to Dock and then change the icon for the alias ie. not for the actual app. Downside is that you get a small alias–arrow added to the lower–left corner to the icon.