How do I remove icon overlays from unversioned folders in Tortoise SVN?
There is an option in TortoiseSVN | Settings | Icon Overlays | Overlay Handlers. See TortoiseSVN manual for further details.
To remove icon overlays, do this:
Click on an empty area near that directory path. Right click Tortoise SVN settings, go to Icon Overlay, and uncheck Show Icon Overlay for ignored items. It's all done; all icon overlays of the folder are gone.
If it is already revisoned then do this: go to that directory / file. Right click Properties of Tortoise SVN. Select the list item "add it to ignore list". Don't be afraid the file won't get deleted!! AND then repeat the above procedure.