oh my goodness I made some for a songwriting clinic at the studio! I keep them in my backpack at all times, in case I sub for lessons and need something extra to do. I have them broken down into things like tempo, groove/meter, key, number of chords, mood, subject, and then there's a "level-up" which is just full of random challenges like "use pig latin" lol
They are fun! I'd definitely support that