icon wall size adaptation

I really like the estuary skin but one thing is keeping me from using it

some addons only have the option for icon wall or list view but the icon wall has so small icons compared to confluences thumbnail view
the thumbnail view has an acceptable size but with the icon view it’s so small I can’t make out what it depicts making it useless and forcing me to use confluence for the time being.

How can I make the displayed icons in icon wall view bigger ( comparable to the size thumbnail view in confluence has ) ?
if you are willing to help please be specific as I have no skinning experience

thanks in advance