I'm thinking you'd want to use either Tacky Glue or, better yet, Aleene's Jewel-It glue (you can get it at any Joann's or Michaels). I'm afraid something like Elmer's wouldn't hold up for very long. HTH!
If it's for Girl Scouts I would use Tacky Glue or Aleene's jewel glue. Super glue if you can supervise them.
If it's an adult doing this then I would use E6000 glue which is very industrial-strength, but it's very toxic and gives off fumes so better to use it outside.
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