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Patrick's Googly pet rock appears in the episode "The Googly Artiste." Patrick made it using lots of googly eyes and used glue to stick them on the rock. He sold them off as art.
Squidward's pet rocks
The episode, "Once Bitten" reveals that Squidward has a pet rock collection, which Gary covers in slime in the same episode. They were rocks that had eyes. They also were in many shapes, sizes, and colors.
SpongeBob's pet rocks
In the episode "The Googly Artiste," SpongeBob creates a Googly-eyed pet rock as a guide for Patrick to make one for himself.
Based on the events of "The Great Snail Race," it is quite possible that some of the rocks in Bikini Bottom could actually be alive, since Patrick's pet rock, Rocky, is able to win the race by crossing the finish line.