Oh I adore sims 2, its gotta be one of the best computer games. If you havent try this cheat, its amazingly cool...
go on to create a family and make sure your curser isnt in the family name box
press ctrl, shift and c to bring up a little grey text box at the top
type in boolProp testingCheatsEnabled true
then press shift and n
and voila!
It lets you use NPC outfits like the grim reaper
Make your people aliens or zombies, and if you go into live mode, press shift and click on your sim, you get loads of cool options, but I'll let you find them out for yourself.

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