If your family has its own crest or heraldry, choose a crest tattoo, which links you to your sister and to the rest of your family. Crests were originally designed to designate families and clans on fields of battle. They can be vibrant tattoos that you and your sister can share.
Flowers can make wonderfully colorful tattoos, and there are several ways to make them into great sister tattoos. You may choose the same flower in different colors, which recognizes your similarities as well as your differences, or you may choose to get flowers that grew around your childhood home.
The yin-yang symbol, with its symmetry and reversed colors, can remind you that while you and your sister may be polar opposites, you still fit together. This circular symbol has associations with balance and peace, and it can be the perfect choice for sisters who have not always been on good terms with each other.
Think about what you and your sister share in common. Do you both have an affection for a place or a film? Are you both very interested in a certain hobby? Consider getting a tattoo that describes an interest that you both share. For instance, if you both enjoy the theater, tragedy and comedy masks would be a good choice.
You and your sister may choose to get each other's astrological signs as tattoos. This can remind you of your sister's personality and qualities. You may choose to get a design that is made up of astrological figures or of the constellations that represent them.