That's such a cute idea umm hmm it would be kinda cute if you could have a functional in-game camera tool and take pics with it (selfies included!) and in one of the stores there would be a little photo development kiosk and you could get them printed as items and pay to frame them or blow them up even bigger and then put them around your house. But well hmm then you'd end up with a lot so there would also be a little album you could put pics in. Of course there'd be a reasonable limit on the number of pics you could keep (maybe it could be like the item storage and mail storage is) and uhh you can get the camera and album refurnished by Cyrus and give it cute patterns or use clothing fabric or custom designs to make it look good. Also being allowed to customize tools in general would maybe be cool.
I made this up as I went along but I think it's a pretty cute idea so I'm putting it out into this web domain anyways!
There are a lot of cute ideas to be had about these kinds of additions. Maybe it would be cool if there was a list of pre-approved mods that one could download and add to their game (so the burden of all that data storage would be on the DS and not all on the one game cartridge?) Maybe kind of like The Sims, except the mods are free and fueled by fan input ??