Got tired of paying $5 for green tea fraps at Starbucks and wanted to make it at home. Got tips from a friend that used to work at Starbucks. For the smoothie base, I buy it from a local smoothie shop at a mall near my house. They sell me a big bag of powder which I split into small portions and make up small batches to use for this and other smoothies. Haven't tried myself, but this site is selling a similar smoothie base powder: http://www.frozenx-plosion.com