I know I can change every single game individually on my desktop, but that is quite tiresome and I'd like a bulk-solution and in the galaxy client as well.

The icons gog gives with the games are butt-ugly circles and all look the same from a distance. i'd prefer the original icons that were full sized. Does anyone know how to change this especially in the GoG client?

Sure, check %ALLUSERSPROFILE%\GOG.com\Galaxy\webcache folder.

Thanks, this is helpful at least :), now finding some kind of icon library and making a python script or so that can replace all of my icons at once.

Someone (I believe it may be JMich, and if not he may know who) has a list of the old Icons I'm sure... you'd still have to make / find ones for the newer games I assume but it's better than nothing.

Edit:
Found the thread and the online archive:
http://www.gog.com/forum/general_archive/gog_game_icons
https://onedrive.live.com/?authkey=%21ANTWGn2YpOI5e-Q&id=462A30A66DFFAD8B%211065&cid=462A30A66DFFAD8B