Hi,
Thanks for adding your feature request here.
If I change the folder icon color, I can not set the default grey color again.
Yes, we do not set the default color on the color picker. You can add manually the code
"#B2B2B2" on the custom field.
Anyways, this feature could be helpful in some cases, we will keep that in mind for a future release.
Thanks a lot!
Cheers,