The Gemini zodiac sign makes an excellent representation of twins for large and small tattoos. There are a number of options for twin-themed tattoos based on the symbolism of Gemini.
The symbol for Gemini, similar to a Roman numeral two, is an excellent small tattoo design. It can be designed in color or black-and-white, and can be large or small. This flexibility means that this design is possible for any placement, from the smallest to the largest.
The constellation for Gemini is another representation of twins that makes an excellent tattoo idea since it can be rendered in small and large versions, with varying levels of detail. A constellation can be rendered as a simple pattern of stars in a small area, or a design including the stars and mythological representation of the twins for a larger placement. The flexible nature of this tattoo means that it can be placed in almost any area, whether it needs to be discreet or not.
The literal representation of twins can be created with two identical faces or figures. This is a design suitable for larger placements, since the level of detail necessary to create a face or figure is best rendered in a large area. The twins can be represented by the twins of mythology, Castor and Pollux, or they can be simply two similar figures. These designs can be combined with other twin symbols, such as the Gemini zodiac or constellation, to reinforce the meaning.