as thick as peas in a pod—(also: as thick as peas in a shell) intimate or very friendly:
- He and I are as thick as peas in a pod. He comes to me with most of his troubles.
like two peas in a pod—very similar; almost exactly alike:
- She and Karen are like two peas in a pod—they both sing in clubs, share the same dirty laugh, smoke the same brand of cigarettes.