I would love to see these three types available from h5p someday:
1. Metronome, with tempo/time signature controls (I saw someone recently on the forum saying they were developing music ed related types, so I think this would be a fantastic addition)
2. Randomized "dice roller": with one or more configurable "dice", each containing 2 - ? potential options (images, numbers, words, whatever), and when the user presses the button, the dice are rolled and each time they produce a random combination. Great for probability, and other activites.