Naah, that isn't what I was talking about. XD; Well, icons mainly require color enhancements. That's it. Effects aren't really necessary. They can be used if they fit, though. A person aiming to be a good icon maker should have an eye for color. If the colors are eye catching and attract attention of other people, the icon designer can consider himself successful in his attempt to make a good icon.
Ha ha, you only crop them? XD; Well, icons are much more than that. Ask Gav and he might probably give you a two paragraph answer defining a 'good icon'. And to be honest, that's actually right. Icons are harder than tags for me.. ;;