Let us make physical notes with character limits similar to moogle mail. This way, we can pass those notes around for, well, whatever we need a physical note for. Some ideas include:
- Valentines
- Vouchers for items
- Invitations to a party
- More customized, personal wedding invitations
- Keepsakes

This obviously wouldn't replace the moogle mail system, but rather, address a shortfall in its design. Physical notes could even be tabletop furnishings if you wanted, so players could actually make a desk littered with notes that was, in fact, littered with meaningful notes. It can be a very useful roleplaying tool for a wide variety of situations.