I'm working this days on this idea: a group of young Hobbits that find adventures in The Shire. We talked about possible ideas in another thread (which I can't find right now...). It's in spanish, and I'm using very light rules also posted as TOR for kids in the House Rules subforum.
Eventually I'll try to translate at least a summary to english.
In fact, the idea I'm more proud about is that the 4 pregen characters will be four young hobbits (below 33 years old) that want to beat the bounds when they get older. Therefore they call themselves The Hobbeats.
Their names are Jon, Pol, Georgia and Bingo.
They also are the favourite nephews of some uncle, who calls them "my fav' four".
A fifth pregen is Georgia's little brother, Martin. As there's another Martin in town, he is always called Georgia's Martin.
[In case someone wonders, the other Martin is a stutterer and people, in mockery, call him "Err Err Martin". But in our tolkienesque Shire people don't laugh at other's characteristics. That's only done in other people's worlds.
]
A sure LMC is Phil, a weird cousin who lives in Scary. He likes to play pranks involving ghosts. Therefore, he is known as Phil "the Spectre". In his adventure, he claims to be hearing noises coming from the quarry in Scary. Everyone thinks this "wall sounds" are another of his jokes.
A Journey through a strawberry field is assured...