You mean...Illustrator? As in the Adobe program? I might be able to make one if i knew what popcorn looked like (I assume you are not talking about food).
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well for a standardd popcorn brush, Adobe has a download for theatre stuff, I have it...you can download this file: (right click link -> save link as) www.amysrabbitranch.com/theaterstuffBR.ai then 1) Open the .ai file 2) you should see the brushes and such in your brush pannel 3) "save brush library" and you'll always have it =)
Self-deleted due to large troll population on the forum, and absence of moderation.