Here are some:
- A project gets late, one day at a time. (you can say this one is about scope creep)
- Quitting is the best remedy to scope creep
- Scope creeps nearly at the same time as a scapegoat is found
- A project without scope creep is like a virgin on a tropical island: They both don't exist but we try to believe they do.
PS: The last three are MY invention!