Oil and water.
Sleep and a newborn baby.
Peace and the middle east.
And this combination of art posters I found on amazon.com:
Lithuanian Wolves Eat a Horse and a Baby Animals Giclee Poster Print by Achille Beltrame, 18x24
Yes. Yes, that's always what I look for in tandem: A poster of cute little baby animals, and a poster of an angry pack of wolves tearing apart a frantic horse. Thank heavens I don't have to worry about purchasing them separately anymore. Phew.