Sorry to bump an old topic but rather than creating a new thread exactly the same, I thought I might as well add some ideas, as I'm on the Sims a lot. Here's some of mine (I have Sims 2 by the way, and these ideas are better with the expansion packs):-
Make a haunted house by building an abandoned-looking house, move in some Sims then kill them, then move in a Sim couple
Make a party house
Make a busy household by having a single parent move in with 7 kids (use the ''motherlode'' cheat so the adult doesn't have to work)
Build a peaceful country cottage surrounded by flowers and trees and a pond
Make your dream life
Get a Sim pregnant and use the cheat to make her have twins, triplets or quads (forgotten the cheat but you will find it somewhere on a Sims cheat site)
Move in 7 different adult Sims; a depressed loner, a goth, a nerd, a tart, a homosexual, a hippy, and one that's sporty
Build a swimming-pool in the back garden
Have some Sims form a band, using every musical instrument you have in the Sim catalogue
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Female