variegated plant?

Snow and hail yesterday and today it's gorgeous.

I was given a cutting of a groundcover by a favorite nursery. They 
didn't know what it was but said I could try it. It's become a real 
favorite over the last few years as it tolerates drought. My problem is 
I can't find pictures of it anywhere and neither they or I have been 
able to figure out what it is.
. 
I think it's a perennial, mustard as the flowers have four, white petals 
and the fruit looks like the small mustard fruit. The leaf color is a 
grey-green and edged with off-white. The leaves are about 1" long, 
toothed, ending in a point and clasp the stem. The plant is a bunch of 
small rosettes spreading out in clump fashion on prostrate stems 
(ground-cover like). 

I hope this description is clear enough to trigger a bell. If anyone has 
any clues I'd love to know. If you know where there might be a 
photograph all the better. If you want to examine a leaf - I could press 
a couple and mail it to you. 

Many thanks,
Kris in northern CA

PS Ginny, I received your Aconite while I was away and will send you 
some of this or something else if you prefer.

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