I dunno, cartoons, video games, what would they be? Personally, I'd Love a final fantasy space, public or personal (either on the xiii series or xiv) or an adventure time space, complete with a finn and jake treehouse personal space and princess bubblegum personal space
since you brought up the FF series, may as well go full bore and suggest a space that encompasses the entire series from FFI all the way up to FFXV (still a WIP if i recall). AT might be a big seller with costumes, companions and the works. do need a Gran Turismo space, personal or public.
I'm sure a full FF universe recreated in Home would be a smash hit. However I think the usual dev problem applies here... the time required to create and maintain such an online presence in Home would steal away from the same resources needed to create the next FF game. It's times like these that I wish Home had been designed more like the Minecraft world model but with the LittleBigPlanet Creator tools built-in for the physics and textures. Let the fans go full bore and bring FF13 and 14 to life in Home Obviously there's a market for something like that, if someone could figure out the malthusian problem of 3D world creation: hi-resolution stuff created by us would end up outstripping all available server storage capacity in just a few months.