I only store things I don't know what to do with yet. I'm still designing and don't have all of the land yet. The bottom of my SF looks like a disaster area (I'm sure my in-game forum friends can attest to that).
I have put away most of my NPC's (ie...Zombies don't walk in the Winter. I do keep SLH, Snowball II and Stampy out as they are Family).
I do have a bunch of decorations in storage. I buy things as I'm decorating, and sometimes I don't like the outcome, so I just store the stuff for use later.
I'm no where near a design genius like barryriddl474! Have you seen this man's town? Every time you visit it seems like there's something new!
I know, I'm rambling. I blame it on the continued egg nog drinking. The egg nog carton is just that, having been emptied days ago and now is just a foil for Bacardi Rum! (Shhhh! :lol: )