Custom Collection Icon?

Is there anyway to do this (at least easily)? I found a thread that was 2 years old, not sure if anything has changed since then. I also looked through the collection manager thread.

I just don't like the icon, its ugly and they all look the same. I'd be more than satisfied with the first book in the collection being the collection icon.

I'm on 5.4, PW2 if that makes any difference.