All of our concrete (sidewalks, patios, driveways) are a sand color, however we do have a house that it is all white.
When it's being poured (wet) it looks like a grayish putty color, but dries to a white or sandy beige.
I've seen gray concrete before.
Abbey--too much of the same color. (Pots, lion and your concrete itself) IMO.
What color is the outside of the house?
I would paint the lion RED! And then I'd make sure to plant RED geraniums or RED impatients or something RED.
If red clashes with your home's colors, take a color from the peacock feather--PURPLE! Paint the lion PURPLE. And plant PURPLE petunias.
Keep everything else concrete color.
The lion told me it does NOT want to be gray. Blah.