These are the opposite of the kind of perfect couplet you're talking about, as they use much overworked rhymes that are not, in themselves, clever at all.

But I always thought there was a kind of perfection in the sparse couplets of 'Memories Are Made of This', each managing to paint a vivid picture in just 8 words:

One girl, one boy,
Some grief, some joy.

Your lips and mine,
Two sips of wine.

One man, one wife,
One love through life.