What is the symbolic meaning of a blue butterfly tattoo?

when my uncle died, we got a poem at the wake that explained he was like a blue butterfly that flew into the beautiful blue sky and became one with it. and although we could no longer see him, that didn't mean he was no longer with us... i took this symbolism pretty seriously and am getting a tattoo of a blue butterfly with the words "although i can't see you... that doesn't mean you're not here".