Are you allergic to the normal mixed proteins or is it your trying to save money more than anything?
If its the money, then my advice is to buy some of the normal mixed protein in a flavour you like and mix it half half with the unflavoured protein as it is then bearable. Ive tried the natural one by itself and it tastes like crap.
Aside from the falvourings above, you could add a few frozen berries, which i find work fairly well. You only need a few to flavour a shake. Use a blender or a hand blender when you mix the natural powder. Or else there is a shaker bottle on the myopure site that has a metal whisk ball in it to break up the clumps.
Cheers
H