Well, i am sure its arround somewhere but i always get frustrated when i have to search for sims2 stuff.....
and this file only took me 15 minutes to make so i really didn't lose time

Altho it says replacement, it isn't.
Its a small file that prevents the Rock/Stone to load that comes with the following neighborhood objects:
Ducks
Pigeons
Birds(2 files)
Geese
Swans
Seagulls
The clouds
Hanggliders
Blimp
HotairBalloon
Sailboats
Place it in your Defaults folder in your Sims2 Directory.
Remove it when you want your rocks back

The blue bounding box is still there so no worries that you cant move/remove or delete it.