My ground phlox (possibly Phlox subulata/moss phlox) has achieved blanket status.
I'm a sucker for mass blooms. A friend of mine has large swaths of this phlox & was kind enough to borrow me a cup 2 yrs ago. A cup that was 1.5' x 2' chunk that I then plopped down in a 1.5' x 2' space.