I write, so the semicolon shirts I have work two ways. Those close to me giggle when I wear them.
I also have a really cool necklace that is a great clay version of the small and large intestines.
While I know the purple ribbon is for Crohn's as well as a number of other things, but it doesn't feel right as a tattoo for me. Yes, I am also looking for an obviously Crohn's tattoo as well.
Being a Leo, years ago I was looking for a cool lion tat. I found this Red Lion Club out of the UK that is a group for those who have had the j-pouch surgery, something done for some with Crohn's. I contacted them and now have their lion on my back, but with a few of my own personal quirks. For me it was everything falling in place for the perfect tat for me.
I guess what I'm saying is you have to find your own representation if you can't find what you're looking for.
I'll post a copy of my lion in an album so people can see him. EDIT: I just changed my avatar to a picture of my lion.