Figured at least some of you might be interested in this… bonus points for coming up with nicer mnemonics. 
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They that’s cool! I’m totally going to steal this format for some languages I’m learning.
@bjoern.gumboldt Where does it come from?
One idea to make it even better is to arrange the images according to IPA (where in the mouth). I mean the vowels could be arranged on the frontness-backness & open-closed axes, and maybe the squares could be switched to circles for rounded vowels. Similarly, you could arrange the consonants.