Congrats on your progress. I also have been doing the green smoothies 3-4 days a week, mostly because I'm to lazy to cook. You might try to add some fat i.e. coconut oil, avacado, macadamia nuts. Also spirulina and chorella powder will REALLY help with the cleanse. They make the GS bright green and a little earthy/fresh, kind of grows on you.
look here for some ideas
Green Smoothie Recipes