I made an icon for my Lego folder using the Lego Groups logo, so just sharing this too. (Source: here
Just 5-10 minutes work in Gimp, so nothing special. However I find using folder icons on your most used folders as a great way of Highlighting them. I also find them much easier to tell them apart/locate.
Only .ico file supplied, no PNGs.
I do not include 96x96 or 128x128 because it looks like Windows ignores those anyway and just downscale the 256x256 version.
EDIT: btw, if anyone have a good render of a 2x4 red Lego brick in at least 256x256 resolution (if transparent background, should be higher if not) that I can make a icon out of, I would be happy to see it.