We pick up a set here.  

http://www.mustangsunlimited.com/

I've got a '07 GT, Vista blue w/ dark graphite interior.
Car came with optional heavy duty "mud" floor mats. They are black w/pony
molded into them.
Pony is black,all one color FYI
Wife has issues when wearing certain heels with these mats as they have the
heavy grooves, manual trans BTW, but she will pull a stock mat out of the
trunk for those days as it's a girl shoe thing and car style thing that
she's willing to deal with.
OEM regular mats have no logo in my car, got the car with both styles as the
mud ones are dealer installed, was on the window sheet and they screwed up
and gave us both types.
Check the Fomoco accessories website, they probably have the grey ones to
match.

my Vista blue GT convert has the light beige leather.....including very
impractical light beige carpet and factory floor mats.

I ordered extras from JC Whitney: appear the same as from several other
dealers, except cheaper.......in fact, appear identical to factory
including the hold-down.........except a number of colors available.  I
got dark blue for everyday - looks good.