Since writing this request, I've since found this FAQ:
It appears that even within these box label colors, there is some variation, but to generalize:
- Green label (GREAT) - pre-ban and all the evil features
- Yellow label (GREAT) - pre-ban custom
- Blue label (OK) - depends on when made, as some blue label are pre-bans and contain some evil features
- White label (GOOD) - some green and blue label features
Haven't found any info yet on "unblocked" though...