Every cloud...
has a silver lining
The early bird...
catches the worm
The grass is always greener...
on the other side
Don't count your chickens...
before they've hatched
People in glass houses....
shouldn't throw stones
If you can't beat them...
join them
It takes all sorts
to make a world
Never look a gift horse...
in the mouth
When the going gets tough...
the tough get going
When in Rome....
do as the Romans do
If it ain't broke...
don't fix it
Too many cooks...
spoil the broth