Carey Shockey  shows off his rendition of the Red Line at the Andrew-JFK/UMass tunnel, done a year ago at Karma Tattoo in Somerville. He explains he used to live in the Polish Triangle in Dorchester. See it larger .
Kaitlin Maud, meanwhile, has the entire MBTA map on her arm  - both subway and commuter rail (in the photo, north is at the bottom, Green Line on the right):
Meghann  also has a system map - but just for subways:
She reports she got it when she was moving away from Boston for awhile and wanted something to remind her of home. She adds:
It helps me find fellow Bostonians out in the world.
And no, she says, she is not going to have the Somerville extension added to the Green Line.
Any Blue or Green Line tattoos out there?
Hatchet writes :
I was going to get a Green Line tattoo but the tattoo artist broke down.
Scott Montminy  says that's probably just as well, since:
The needle would have to jab you slow and jerky like, and stop occasionally for no apparent reason.
Georgy doesn't want something so permanent, so is thinking of a temporary Night Owl tattoo 
- Dorchester