MIDIs are all I know how to make so far. My usual process is "goof around on the piano, find something that sounds nice, rush to recreate it in Anvil studio". I've accumulated a couple dozen MIDIs this way, most of them unnamed, really short and not to be considered full-fledged songs (which is why I like to call them "musical notes").
Many of these would probably sound repetitive and flat to the sophisticated ear. I do think they're listenable, though, and well worth sharing.
These are the ones I like best: