I can't help with any tattoo ideas, I'm afraid, but well done for kicking the habit and I wish you the very best of luck in staying off.
Someone I knew of and liked a great deal kicked heroin. Unfortunately he was unable to find work or friends afterwards, became very depressed and took his own life before he'd given the world a chance a give him a chance. Please don't go there. You've done brilliantly so far, but you're probably aware that there's still a long way to go. People do care, so don't you ever forget that.
Again, well done!