I posted about these a long time ago, but haven't gotten around to uploading them until now:
Pathfinder: Folder Icons for Mac and PC
Chaosium Basic Roleplaying: Folder Icons for Mac and PC
Labyrinth Lord: Folder Icon for Mac
Swords & Wizardry: Folder Icon for Mac
Because of technical hurdles, the Mac icons are generally enlargeable to 128x128 pixels, whereas the Pathfinder Windows XP icons can only be enlarged to 48x48.
Tales from the Yawning Portal
1 hour ago