Couple Tattoo Ideas
The best couple tattoos work on their own and make a whole together: two halves of a heart, a lock and a key, sun and moon, two puzzle pieces. Small fine line designs on the wrist or finger are the most common choice.
half of a heart that matches its other halfMinimalistMake a similar design → 
a sun (one half of a matching sun and moon pair)Fine lineMake a similar design → 
a lock and keyFine lineMake a similar design → 
two puzzle pieces fitting togetherMinimalistMake a similar design → 
two swans forming a heartFine lineMake a similar design → 
a king and queen chess piece pairFine lineMake a similar design → 
a heartbeat lineMinimalistMake a similar design → 
two hands with pinky promiseFine lineMake a similar design → 
a matching wave and mountain pairFine lineMake a similar design →
Questions
What are good matching tattoos for couples?
Sun and moon, lock and key, puzzle pieces, matching halves, king and queen and a shared date or coordinates are the most popular.