I decided to pair these 2 covers together as they  both have a contemporary crisp look.  Both fabrics were from KRAVET Fabrics,
the navy blue & white is China Club Collection, Diane von Furstenberg Signature, color: Indigo, 100% linen  -and-  the 2nd fabric medium blue and navy is Courbet Collection, Jonathan Adler Charade, color: Reflection, 50% cotton/ 50% linen.  I backed them in
100% linen in a crisp white.  They measure roughly 23 1/2" x 16 1/2", have invisible zipper closure and the seams are finished
to prevent fraying.   The 4 corners are slightly tapered so when adding your pillow form the corners are not empty and don't "dog-ear".
I highly recommend purchasing down fill pillow forms to really fill them out nicely.   A local upholsterer can make them for you or perhaps  an online supplies.  I used 17" x 27" forms for the photos.  Perfect for a contemporary interior, nautical, beachy theme.  
Made in the USA.   Thank you for shopping my items.  Very fair pricing for these designer fabrics, plus labor to make them.
Firm on the price.  Again, thank you.