Almond Paste can be used in your smoothie to add that add nutritional value.  You might use it instead of peanut paste.  Although peanut paste and almond paste have similar nutritional values, almond paste is slightly healthier.  
 
Mix a tablespoon of almond butter and a sprinkle of cinnamon or cocoa into your smoothie together with some yogurt will bring some extra flavor for your enjoyment.