Does anybody know how to make a script where a player's profile picture is randomly chosen?

please provide a better explanation of what you're looking for, also this is not a request site. try to figure it out yourself then if you're still stuck post it here and we will help you. there are great resources that you can look into such as the roblox wiki

PlayersService:GetUserThumbnailAsync(): https://developer.roblox.com/en-us/api-reference/function/Players/GetUserThumbnailAsync

Did you check the wiki. They have tons of stuff