Hey. Go to this linK: http://www.mobafire.com/league-of-legends/forum/signatures/lacorpses-signature-caf-11521 , follow instruction, wait and you should have your signature like what I have mine now.
Sole Credits to LaCorpse for this awesome sig!
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http://images3.wikia.nocookie.net/leagueoflegends/images/thumb/4/49/Riven_BattleBunnySkin.jpg/640px-Riven_BattleBunnySkin.jpg saying MortalCombat
and http://www.bug.hr/_cache/0bcef518246a7b2f3573bba6b41e7ec8.jpg saying MortalSpells