I'm a Believer Shake

I don't know if you are old enough to remember the Monkee's song "I'm a Believer" but I can't get the jingle out of my head after today's mid-morning shake. 

I'm always interested in shake ideas (Roni at Green Lite Bites shared one with Green Tea as a base, on my list to try) and an ingredient I see occasionally in shakes is raw spinach.  Now don't get me wrong, I love spinach, raw or cooked but my knee jerk response to it as an ingredient in a shake is "BLECH!"