Eh... I've once briefly considered spriting the strawberry fruit bats, if that answers your question. However, I don't think that many people would be all that interested in the random animals.
Eh, depends on what kind of notes you're talking about. I mean, I do have a to-do list of sorts, but ultimately, I just end up spriting whatever random character I'm in the mood for at any given moment more often than not.
Sort of like Rarity and that cloak salespony, but instead of barfing she just glares at it while Fluttershy starts a conversation about it similar to AJ's truck and Twilight. If Flutterbat is present then AJ just trots away.