I had the pleasure of working for a friend of mine, which is a Brazilian jiu-jitsu teacher.
He asked me to design his team's animal - the mighty and fiercing Koala wink emoticon
I had a lot of fun designing the Koala character as well as the shirt.
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If you who are interested, I've added a few links to check him out:
https://www.facebook.com/groups/koabjj/
http://www.nogibjj.co.il/