I guess most Sims 2 gamers know how to place clutter randomly on any surface, but in case you are a Sims 2 "dummy" not familiar with the techniques here is some info for you:
- When in game use cheats: moveObjects on, boolprop snapobjectstogrid false, boolprop allow45degreeangleofrotation (if you wish to enable 45 degree object placement: use < and > keys);
- Use OMSPs to place the object anywhere in the sim room;
- Make your OMSPs invisible by clicking on them in design mode or simply download this nifty OMSP controller (this way you can make them visible again in case you need to relocate or remove your OMSPs).
P.S. Get my OMSPs for vanity tables here