I have a Jack La Laine juicer that I don't use much anymore but my favorite blend was always carrots/beets/ginger. Yes, I know, the carrot police are everywhere.
The juicer is also good for using up veggies that are a bit past their "best by" date in your fridge but haven't yet gone bad. Stuff like spinach, the kale you meant to get around to cooking, the slightly bruised romaine heart, etc. This way at least they get used and not wasted.