Variegated, ferny type leaves

This is growing around the north side of the house and around one Lilac bush. Since these are the only areas it is growing I am inclined to think it is a flower and not a weed.
Anyone know? TIA


Variegated, ferny leaves ( photo / image / picture from LilyJunkie's Garden )

 

Almost looks like our creeping buttercup.....

 

I was thinking Creeping Buttercup too EJ.

 

Thanks!
I think you're right and it is this: http://www.gardenstew.com/plantstew/18642

 

I have that too. Spreads like wildfire
But I like it, so it's okay :-D