My ideas are:
I like the idea of three roses to represent my sisters and I like these... link
I'd get mine with cleaner lines and richer colors though and slightly different placement...
An anchor design with ropes/ribbons going down in and having my sisters names written on them because they are essentially my anchors and they keep me grounded.
Most Helpful Guy
Both really nice ideas, filled with meaning. The roses are the much more feminine choice, an anchor kinda screams 'muff diver'. Ultimately, it's your body and it's up to you.
I'd personally never get a color tat, heard they fade, hurt like a bitch etc. however, I would happily get a tribal tattoo across my shoulder and chest and then maybe one across the centre of my back at the shoulders. Just look so cool, not gonna lie.