Apartment Therapy posted a round up of their 'best use of color in an apartment' entries. Turquoise seems to be a popular choice. These two are my favorite.
I love the contrast of the white couch with the turquoise wall.
I have lofty dreams of cramming as much color as I can into my first place. This apartment seems to a great job of all mixing and matching all the color. The only thing I am not a fan of is the couch. It's a fun piece but just not my style.