The mural shows the faces of six officers who worked to evacuate people before the blast and reads "I Believe in Heroes."
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The wording is a play on the famous "I Believe in Nashville" mural.
The officers are Amanda Topping, Michael Sipos, James Luellen, Brenna Hosey, James Wells and their sergeant Timothy Miller.
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The bombing took place early Christmas morning. Investigators said Anthony Quinn Warner, 63, blew himself up in the blast.
Despite hundreds of tips and leads, as well as a history of investigating Warner, his motive for the explosion is not fully known.
Warner did subscribe to many conspiracy theories, and his ex-girlfriend said he had threatened suicide in the past.