I think something that would be really nice to have just for fun and for downtime is musical instruments that characters can play. These wouldn't give any bonuses like a bard's lute but just be for players to mess around with, there is a system for this in Lord of the Rings Online and from what I've seen and experienced with it it's a lot of fun to play with and make songs or try to recreate songs. I'm sure many munchkins would see it as pointless because there aren't enough attack roll pluses heh, but seeing as this is a D&D game, roleplay and roleplaying aspects of the game shouldn't just be left out. Maybe I'm just a silly roleplayer but I feel like this would be a really fun addition to the game, it would give life to taverns and street sides.

I made a list of potential instruments that could be used:
-Lute
-Mandolin
-Bagpipes
-Harp
-Horn
-Flute (or alto recorder)