Ehhmmm script up a bunch of boxes or objects.
If cheats are set to ="1", you can use this command to create any objects you want. look, I even made a bind key for you.
Dynamic prop:
bind "v" "prop_dynamic_create props_foliage/tree_deciduous_02a.mdl"
put that into console, and now every time you press V, you will make a big birch tree!!!!
LOL.
When i was on surf_skyworld, I made a staircase of boxes. If you spawn tons of objects everywhere, it makes the server bog up really fast, and it makes it crash.
Try that. If you want to know any more fun console commands, ask me.