FUCKING HELL, stop quoting shit that is RIGHT ABOVE YOUR POST (this goes to everyone)
...I know the feeling.
Anyway dude I think it looks really great what you have been doing keep it up! :-)
In case you need some other ideas...sewer manhole/lid (animated steam?), puddles, drains, street lights etc.
And its always fun to have stuff to smash up like parked cars (can jump on top) and or parking meters, telephone booths, newspaper stands etc.
Hot dog stand would be cool to smash with hot dogs that give your health back lol.
An electrical store could be fun to have in the background with a big glass windows full of animated tv's...lots of stuff to break hehe.