This is a lovely high quality outdoor as well as indoor rug.  I hope you can see the colors more vividly on my attached photos.  The contrast between the gray and white is more of contrast than in the more muted Wayfair photo.  The print has a southwestern flavor.  Some gray areas on the rug have blue undertones.  This rug would go beautifully with navy and brighter whites, as well as, grays and blacks.   If you like a warm color pallet, I might choose brighter hued colors such as, orange, bright yellow and grass greens.  It is a fun rug to dress up for an elegant look or make it more playful with brighter hues.  
It will be fun to be able to change the look of this rug with a few accent pieces and pillows!