Ha ha everyone sees a different plant.
![Laugh](images/smilies/laugh.gif)
The silver one looks like one we have called "Snow in Summer". Curse my tongue for saying such a words (since we had the real stuff
![Crying](images/smilies/cry.gif)
).
![Wink](images/smilies/wink.gif)
It is white flowered and spreading, yes, invasive as all get out. Dandy ground cover for a place you just want foliage/flowers and never intend to put anything else.