Vegetable juices are the cold drink phenomenon at trade shows and now on cafe shelves. Savse's broccoli, pear, spinach, kale, kiwi, lemon and banana drink. Vegesentials have celery, apple and kale juice in the green bottle below and more half fruit/half vegetable juices and smoothies at
http://www.vegesentials.co.uk/
Pain Quotidien has their '1 a Day' Green Juice of swiss chard, celery, apple, orange, lime and ginger.