Your Frapps look good! Every day I drink a protein shake I call my "homemade frappuccino," lol. I make it with plain yogurt, coffee, whey protein powder, cocoa powder, sugar, and ice (and whipped cream on top if I have it, which I don't always). It tastes kind of like a mocha frappuccino. Sometimes I add espresso shots too (I make espresso in a moka pot on the stove). I drink the protein shake because otherwise I have low blood sugar, but it's also a good way to make a yummy drink that is normally sugary, to be more balanced and full of protein.

I wish you good luck with your coffee shop!