Cranberry juice
Freshly squeezed orange juice
Freshly squeezed lime juice with a hint of green food colouring added to the lime juice.

Pour the cranberry juice over some crushed ice until the glass is about half full. Then pour the orange juice slowly into the glass over the back of a spoon, followed by the lime juice. This means that the juices won't mix as much and you get a cool graduation of colour.