Thanks for saying so.
It's a closeup of a garden variety of alyssum. I'll toss it in the database when the resident-professional gardener around here (she's the smart one, you know) reminds me of the exact name (she's told me before, but my brain is leaky).
There are several other alyssum shots in the Rube Goldberg photography gardening idea post from a while back:
They're such tiny little things - but so beautiful when you get to see them at such close range.