Over the past couple months I've been drinking quite a bit of green tea, mainly for its stimulating effects. I find it to provide a much cleaner stimulant effect than coffee, and when making it into an iced tea its much more refreshing. Even more recently I found a product made by lipton which I absolutely love.
I'm sure most of you have seen those little crystal light singles...well lipton makes a green tea version (calorie free). It comes in several flavors: cherry, peach, citrus...even a blueberry one which was just awesome. Its extremely convenient to throw a few of the packets into my bookbag and when I need a little boost I just throw it into my water bottle and have quality instant green tea. The flavor is mild, but quite good if you like tea.
Anyway, what I'm trying to get at is that I think that this type of product would make an awesome addition to your RPN product line. Take a high quality green tea powder and sell it in bulk with a scooper, or possibly make the individual packets as lipton/crystal light does. Since NP already has flavor systems, I'm assuming that it would be fairly easy to add some flavor/artifical sweetener to the tea.
Its just a suggestion, but I really hope that you consider this type of product...I think it would sell very well if done correctly.